What I find in my practice is that affairs happen because misunderstandings and resentments don’t get talk about. When difficult feelings don’t get talked about, resentments and hurts build up and ultimately become toxic. When this happens, often relief will be found elsewhere and with someone else.
No chart notes, no paper trails, no group work: what happens in session stays there.
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The Short Answer: Why Affairs Happen
Affairs happen most often when a relationship is experiencing a deficit, a deficit of narcissistic supply. The person who cheated may still love their partner but feel very alone because they are missing the experience of being desired, seen, and alive in the eyes of their partner. This piece explores the psychology behind the deficit and the need for narcissistic supply.
Affairs Are a Way of Acting-Out
“Acting-out” is a clinical term that describes behavior that expresses feelings that can’t yet be put into words. A person who can’t say “I feel invisible in this marriage” may, over time, act out in a way that provides visibility. Most affairs aren’t planned, they’re an expression of the longing for something they don’t get with their partner.
In writing about infidelity, I describe most affairs as an “acting-out” – behaviors driven by longstanding patterns of hurt, anger and resentment. That framing runs counter to the cultural context which tends to label the person who cheated as weak or selfish. However, it’s most helpful to understand what happens in the relationship from both sides.
The partner who had the affair is not someone who woke up one day and decided to destroy their family. Often they’re a partner who had been carrying something they couldn’t say for a long time and the weight of it eventually expressed itself through behavior.
Why People Cheat on People They Love
Love and insufficient narcissistic supply often exist in relationships simultaneously. A person can genuinely love their partner and still be slowly starving for something that love, on its own, isn’t delivering. The affair is rarely a statement about whether love is present and almost always a statement about something that has gone unmet and unspoken.
The following is a composite clinical vignette. Identifying details have been changed to protect privacy.
Theo and Mara had been together for fourteen years. From the outside, they looked successful: two children they were devoted to, a house they had renovated together, a shared social world, genuine warmth between them. They didn’t fight. Theo described the marriage, early in our work, as “fine.” That word is one I have come to pay close attention to.
Mara had begun an emotional connection with a colleague two years earlier, one that eventually became physical. Theo was devastated when she told him and his first thought and one he kept returning to, was: “But we were happy, why would she do this if we were happy?”
In our work together, Mara struggled to explain it in a way that made sense even to her. She didn’t want to leave Theo. She had not stopped loving him. What she had stopped feeling, gradually and without either of them naming it, was desired. Not only sexually, though that was part of it. She had stopped feeling like someone whose inner life interested him. Their conversations had become about logistics, scheduling, grocery lists. Their physical contact had become affectionate but rote. She had felt, for years, that she was beloved the way a piece of furniture is beloved: familiar, useful, taken for granted.
When her colleague began to pay attention to her, it started as attraction — the kind of attention and attraction she didn’t get at home with Theo.
What I said to Theo, and what I say to many betrayed partners: the affair wasn’t about whether you loved each other. It was about how and to what extent the two of you were available to each other. When there is not enough narcissistic supply, the amount of deficit may drive a partner to notice and engage with supply from someone else.
Narcissistic Supply and Why Its Loss Drives Infidelity
I want to use the phrase “narcissistic supply” carefully, because it carries baggage. Pop psychology has absorbed it as shorthand for what pathological narcissists drain from people. That’s not what I mean, and it’s not the clinical origin of the term. Fenichel first articulated it in 1938 as a type of admiration and interpersonal support drawn from one’s environment that’s essential to self-esteem. My dissertation on narcissism emphasized Fenichel’s orientation that narcissistic supply isn’t a pathological supply. It’s a developmental need. Every person requires feeling noticed, valued, and alive in the eyes of others. This supply should not be only framed by narcissistic personality disorder (NPD).
For more on this distinction, my piece on what narcissistic supply actually means goes into this more fully, and the relationship issues page on narcissism addresses how it operates in relational dynamics specifically.
In long-term relationships, narcissistic supply tends to diminish in predictable patterns. What I see in clinical work is that infidelity most often unfolds via four pathways: loss of erotic charge and feeling desired, accumulated unspoken resentments, imbalance in emotional labor, or a chronic experience of feeling invisible. Most affairs I have worked through with couples involved more than one of these at once.
When Feeling Desired Goes Quiet
Early in a relationship, being desired by another person is one of the most potent forms of narcissistic supply available to us. The experience of being wanted is also, at a deeper level, the experience of feeling valued, alive, and worth pursuing. That doesn’t have to be explicitly sexual, though it usually carries an erotic charge in the beginning. It’s the feeling that the other person’s attention seeks you out.
In long-term relationships, that feeling tends to go quiet. The urgency softens into familiarity, which is natural. The problem is that neither partner usually names it as a loss. It’s treated as just what happens over time, and so it goes ungrieved and unaddressed.
For some people the quieting is manageable. For others, it accumulates into a growing sense of invisibility, a slow certainty that they’re no longer seen the way they once were. The affair restores that feeling, temporarily and incompletely, but the restoration is real enough to be compelling. The affair isn’t really about the sex. It’s about what the desire communicates: you’re desirable, worth wanting.
The Weight of Unspoken Resentments
The second pathway is one I see constantly in couples work, and the one most often missed before infidelity occurs. Resentments don’t usually announce themselves. They accumulate in small increments: a birthday acknowledged too briefly, a comment that dismissed something important, years of being the lower priority when work competed for attention. None of these, on their own, rises to the level of a conversation. Together, over years, they calcify.
Consider what this looks like in practice: one partner stops expecting to feel important, stops raising the small things because they stopped believing the small things would land. The other partner, on the other side of that wall, may genuinely not know the wall exists. They experience someone who seems to have stopped engaging, when in fact their partner stopped believing that engaging was worth the exposure.
Affairs often happen after years of this accumulation, not because someone stopped caring, but because they stopped believing the resentment could safely be spoken. When an opportunity arrives that requires no vulnerability, no history, no risk of contempt, it can feel like oxygen.
Emotional Labor and the Partner Who Disappears
This is a pattern where one partner ends up carrying most of the relational weight: the logistics of the household, the emotional tracking of the children, the attunement to the other partner’s moods, the planning that makes their lives together workable.
Over time, this person can begin to feel less like a partner and more like a caretaker. The relationship becomes something they manage rather than something they live in. When this partner has an affair, it’s sometimes the first experience they’ve had in years of attended and thought about from another person’s desire rather than their need.
Why Do People Cheat in Happy Relationships—The Biology Beneath the Question
Why do people have affairs when they’re happily married? This question resists easy answers, partly because “happy” covers a wide range of relational realities, and partly because it implies that happiness should be sufficient protection. Biologically, it’s not always.
My own writing on infidelity draws on evolutionary context here, not as an excuse but as intellectual ground. Men evolved toward novelty-seeking, toward reading sexual opportunity as biologically advantageous. Women evolved toward securing reliable care, toward attaching wellbeing to partners who would invest and remain. These aren’t stereotypes; they’re deep biological grammar beneath human mating behavior, complicated by culture, individual temperament, and attachment history.
These drives don’t vanish inside a committed relationship. They’re redirected. Freud named this process sublimation: the channeling of instinctual drives into committed family life, professional achievement, social contribution. Sublimation, in his view, is the ground of civilization. The person who overrides their biological pull toward novelty to remain faithful isn’t following their instincts. They’re sublimating them.
Sublimation holds only when the return is sufficient. When a relationship provides enough recognition, enough erotic aliveness, enough reciprocal investment, the instinctual drive stays redirected. When the relationship is broadly functional but specifically starving, when the container is intact but the nourishment inside has thinned, sublimation begins to fail. A relationship can look happy and feel adequate in most ways while still being insufficient in the particular way that this particular person needs. That’s how you get a “happy marriage” and an affair in the same household.
Why People Stay Instead of Leaving
The question behind “why do people cheat instead of breaking up” is usually this: if the relationship wasn’t giving you what you needed, why not leave? Most people who have affairs don’t want to end their relationship. They want relief from a specific hunger, a hunger for narcissistic supply. The affair might be an attempt to stay, to keep the structure of the life intact while accessing something the relationship stopped providing. This is why so many affairs are characterized by secrecy maintained over long periods: the person is trying to hold two things at once, which is a measure of how much they value what they have.
Why didn’t they simply have the conversation and say: “I feel desired by someone outside this relationship and I need to understand what that means.” Usually it’s because the person doesn’t have language for what they’re missing, or they stopped believing the conversation is possible.
The affair is chosen not over the relationship but over the vulnerability of asking directly for what is missing. That distinction matters for anyone trying to understand, or repair what happened. My infidelity service page explores this relational dynamic in more depth.
A Clinical Vignette: When Everything Looked Fine From the Outside
The following is a composite clinical vignette. Identifying details have been changed to protect privacy.
Nadia and James were the couple other couples admired. Both held demanding professional roles. They had been together for sixteen years and had the kind of ease in public that comes from genuine history, shared humor, and a long accumulated knowledge of each other. Their social world was full. Their children were thriving. When James came to me after Nadia disclosed an affair, he described their marriage as “strong.”
What emerged in our work was a portrait of a relationship that had, over the preceding eight years, gradually traded intimacy for efficiency. James was the kind of person who managed what he loved: he solved problems, anticipated needs, organized. He had been doing that with the marriage for years. Nadia had been the beneficiary of his organizational care, and also, underneath it, slowly disappearing.
Nadia had stopped sharing her internal life with James because every time she did, he offered a solution rather than attention. Her excitement about a project at work would generate a practical question from him. Her worry about a friendship difficulty would prompt his assessment of what she should do. He wasn’t being cold. He was being himself. But she had begun to experience their relationship as a system she functioned inside rather than a person who saw her.
The man she had an affair with listened differently. He asked follow-up questions. He stayed in the feeling with her instead of moving past it. It wasn’t that he was a better person than James. It was that he offered her something she had been without.
What the affair was communicating, from my clinical vantage, was not “I want out of this marriage.” It was “I need to be known by someone, and I had stopped believing James could do that.” That’s a very different problem, and a solvable one, if both people are willing to turn toward it.
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Can a Relationship Survive an Affair—What Recovery Requires
Is staying really possible? The short answer is yes. A relationship can survive infidelity. But the version many couples attempt, the version where both people decide to “move on,” doesn’t work. Moving on leaves the original starvation unaddressed.
Genuine recovery requires the affair to stop completely. All contact with the affair partner must end; without that, there’s no foundation to build from. Beyond that,: recovery requires radical transparency, not just the cessation of the behavior but the opening of the relational interior that had closed.
It requires both partners to make meaning together of what happened, not to excuse it, but to understand the conditions that made it possible so those conditions can change. It requires grief, actual grief for what was lost, both in the affair’s revelation and in the years of relational starvation before it. And it requires sustained therapeutic support, because the intensity of what surfaces, the shame, the rage, the grief, the confusion, exceeds what most couples can metabolize without a structured space to do it in.
The couples who recover aren’t the ones who are best at forgiveness in the abstract. They’re the ones willing to go toward what the affair was communicating. The affair, as painful as it is, can become the doorway into the relational conversation that never happened. For context on the kind of relational work this requires, the relationship issues hub and the psychoanalysis explainer describe the approach I use.
Whether you’re the partner trying to make sense of an affair or the one who strayed and can’t yet find language for what you did, this is work that can be done.
No chart notes, no paper trails, no group work: the consultation is private. I work with individuals and couples across the country.
Call-303.547.8493 or schedule a conversation here.
What I Have Learned Working With Couples After an Affair
The betrayed partner almost always blames themselves first. They go looking for what they did wrong, what they failed to provide, what they should have noticed. Almost always, they’re searching in the wrong place. The affair wasn’t a verdict on their adequacy. It was an expression of something that had gone unspoken inside the relationship, usually on both sides. The betrayed partner carries enough already without carrying responsibility for the other person’s behavior.
The partner who cheated is often carrying more shame than they can hold. This seems counterintuitive; it seems like shame should produce accountability. In practice, when shame becomes unmanageable it produces the opposite. The person collapses inward, becomes defensive or silent, can’t engage with the direct questions their partner needs answered. The very conversation that recovery requires becomes the one the person is most armored against. Learning to bear the shame without being consumed by it’s some of the most important early work.
The affair is never the beginning of the problem. An affair is the outgrowth of years of patterning that ultimately indicate a deficit of narcissistic supply. This patterning often hides in the midst of daily functioning.
What gives me hope, after the years I”ve spent in this work: couples who find their way through are the ones who finally have the relational conversation they avoided for years. That conversation, pursued with clinical support, can produce something more genuinely intimate than what existed before. You can read more about my approach on my bio page.
If You’re Trying to Understand What Happened
Before thinking about what to do next, consider thinking about a few questions here: What has gone unspoken in this relationship for a long time, on either side? What was the affair providing something unavailable inside the relationship? And for the relationship to change, is it possible to grieve what was lost as well as repair what was broken?
These questions can help organize recovery, or organize a dignified ending – if ending is what clarity produces. Understanding the “why” behind an affair isn’t the same as accepting it or moving past it. It’s the first step toward something more real than either staying in the same configuration or leaving in the same amount of pain.
Whether you’re the person who was hurt or the person who caused the hurt, this is work that can be done. I have seen people come into a consultation unable to look at each other and leave, months later, with something they didn’t have before: a relationship honest enough to be real.
If you’re ready to begin that conversation, I invite you to reach out. I work with individuals and couples in person and across the country. No chart notes, no paper trails, no group work: what you bring to a session stays there. You can contact me to schedule a consultation. For those wanting to start individually, the individual work page describes what that process looks like.
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Related Reading
If this piece raised questions you want to go further with, these pages may be useful next steps.
The infidelity service page describes specifically how I work with individuals and couples navigating affairs, from the initial disclosure through the longer recovery process.
My piece on what narcissistic supply actually is goes deeper into the developmental origins of the need for recognition and why its absence is so destabilizing in adult relationships.
The psychoanalysis explainer describes the clinical approach I use and why depth-oriented work is often the most effective container for something as layered as infidelity.
The relationship issues hub covers the full range of relational dynamics I work with, including isolation, uncertainty, and communication, all of which tend to be present in relationships where infidelity has occurred.
