Relationships
"Infidelity: Why It Happens and What Comes After"
Discovering that a partner has had an affair is one of the most destabilising experiences a person can go through. The ground shifts. The relationship that was meant to be a source of safety becomes a source of pain and uncertainty. And alongside the hurt, there are often questions that feel both essential and unanswerable: why did this happen? What does it mean? Is it possible to come back from this?
There are no neat answers. But there is value in trying to understand what infidelity is actually about — because that understanding shapes everything that comes next.
Why People Have Affairs
The simple explanation is that someone wanted something and they took it without regard for their partner. That is sometimes true. But it does not account for much of what actually drives infidelity.
Affairs are often less about the other person and more about something unresolved in the person who has them. Common motivations include:
Identity and a sense of aliveness. Some people describe affairs as the only time they felt like themselves — not a partner, not a parent, not someone managing responsibilities, but a person with desire, spontaneity, and significance. The affair is not really about the other person. It is about an experience of self that has gone missing from ordinary life.
Escape. A long-term relationship can accumulate weight — unspoken resentments, unmet needs, patterns of disconnection that have hardened over time. Rather than confronting what is wrong, some people find a door out. The affair is a way of being elsewhere without having to have a difficult conversation.
Unmet needs that have not been articulated. Sometimes what drives an affair is something the person has never clearly named — a need for recognition, for desire, for someone to find them interesting. These needs often predate the relationship entirely. The affair is not a solution, but it creates the illusion of one.
Compulsion and repetition. For some people, infidelity is a pattern that persists across relationships, often connected to early experiences of attachment, loss, or how love was understood growing up. This does not excuse the behaviour, but it points to something that therapy can actually work with.
None of this is offered as justification. Understanding why something happened is different from accepting that it should have.
The Aftermath
For the person who was cheated on, the aftermath of an affair can involve grief, rage, obsessive thinking, a collapse of self-trust ("how did I not know?"), and a profound sense of disorientation. These are not overreactions. They are the normal consequences of a significant betrayal.
For the person who had the affair, the aftermath can be more complex than people expect. Guilt, relief, confusion, loss — sometimes a grief for what the affair represented, which itself requires examination.
Both people are dealing with the end of something, even if the relationship continues. The version of the relationship that existed before the affair cannot be restored. What happens next is the building of something different, or the recognition that building something different is not possible or desired.
Neither outcome is a failure.
Can a Relationship Survive Infidelity?
Sometimes yes. Sometimes no. Both are legitimate.
What determines whether repair is possible is rarely the affair itself but the underlying conditions — the degree of honesty both people are willing to bring, whether both people actually want the relationship, whether the relationship had a foundation worth building on, and whether both people are able to sit with the discomfort of what needs to be said and heard.
Couples who do rebuild after infidelity often describe the relationship as different — more honest, in some ways more connected — but they are also clear that the path there was genuinely difficult. It required both people to examine things they would have preferred to leave alone.
Therapy does not save relationships by default. It creates the conditions for an honest reckoning — and from that, both people can make a genuine decision about what they want.
Individual Therapy vs Couples Therapy After Infidelity
Both can be useful. They serve different purposes.
Individual therapy is useful for both partners working through their own experience of the affair — the person who was betrayed processing the impact, the person who had the affair examining what drove it. Individual work creates clarity that is often necessary before productive couples work is possible.
Couples therapy is useful when both people want to explore the relationship — its dynamics, its history, what was not being said before the affair, and what each person needs going forward. It is not primarily about assigning blame or rebuilding trust through a checklist. It is about understanding the relationship as a system, including what the affair was a symptom of.
In some cases, individual work and couples work happen in parallel, with different therapists. This is often the most effective approach.
What Therapy Actually Addresses
Therapy after infidelity is not just about rebuilding trust — though that is part of it for couples who choose to continue. It is about understanding what the affair meant: to the person who had it, to the person who was affected by it, and to the relationship.
Questions worth exploring in therapy include: what was being avoided before the affair? What needs were not being named? What does this reveal about each person's patterns in relationships more broadly? What does each person actually want from their life and from this relationship, now that there is no longer the option of not knowing?
These questions are not comfortable. But they are the questions that produce genuine change.
Paul Reid is a PACFA registered psychotherapist with more than 15 years of clinical experience, offering online therapy across Australia. If you are dealing with the impact of infidelity — as the partner who was betrayed, or as the person who had the affair — support is available.
Learn more about cheating partners counselling, couples counselling, and relationship counselling, or visit counsellingtherapymelbourne.com.au to get in touch.