Infidelity
Whatever happened, you don't have to sort it out alone.
Infidelity throws everything into question at once: the relationship, the past, your own judgement. This is a steady, structured space to work out what's true, what you feel, and what you want to do next, without anyone rushing you toward an answer.
Infidelity doesn't just break trust in a moment. It rewrites the past. Conversations you thought were honest get replayed and re-examined. Time you thought was shared starts to feel like it needs re-checking. Whether you were the one betrayed or the one who was unfaithful, the discovery period has a way of hijacking your attention completely, at work, in bed, mid-conversation with someone who has no idea anything's wrong.
You've probably already tried to think your way out of it. Running the timeline. Searching for the explanation that finally makes it make sense. Deciding, undeciding, and deciding again whether to stay. Logic doesn't hold up well against this kind of shock, because the problem was never a lack of information. It's the flood of conflicting feelings underneath: grief, fury, tenderness, disgust, sometimes all in the same hour.
Well-meaning advice rarely fits either. Friends want you to have a clear verdict quickly, understandably, because watching you sit in uncertainty is hard for them too. But you don't owe anyone a fast decision about your own relationship, and being unfaithful doesn't mean you owe a fast confession of exactly why, either. Both sides of this need room that most people's lives don't naturally provide.
What actually helps is somewhere to slow the whole thing down. Somewhere to feel what you feel without managing someone else's reaction to it, and to start separating the parts you can influence from the parts you can't. We get it, and we know how to help you find solid ground again, whatever you decide to build on it.
What it is
Infidelity therapy supports individuals or couples working through a breach of relationship trust, whether that's a physical affair, an emotional entanglement, or a boundary that got crossed in a way that changed how safe the relationship feels. It's relevant to the person who was betrayed, the person who was unfaithful, or both together, and it doesn't assume a particular outcome. Some couples use this process to rebuild. Some use it to separate with less damage. Some individuals use it entirely alone, without their partner ever attending a session.
Infidelity is far more common than most couples expect going in, which is part of why the shock lands so hard. It rarely appears out of nowhere; it usually sits downstream of longer-running disconnection, unmet needs that went unspoken, or individual factors that have little to do with the relationship itself. None of that makes it hurt less, and none of it removes anyone's responsibility for what they did. But understanding the "why" is often what makes a real decision possible, rather than a reactive one.
With the right support, most people find their way to clarity, even if that clarity takes longer than they expected. This is not a problem you have to solve in the first few weeks.
How this differs from something similar
It can help to separate two things that often get treated as the same conversation.
Focus — Processing the Betrayal: Working through shock, grief, anger, and shame at your own pace Deciding the Relationship's Future: Weighing up whether to stay together or separate
Timing — Processing the Betrayal: Can start immediately, often before any decisions are made Deciding the Relationship's Future: Usually comes later, once the initial shock has settled
Who it's for — Processing the Betrayal: Anyone affected, together or separately Deciding the Relationship's Future: Primarily relevant to couples still assessing the relationship
Goal — Processing the Betrayal: Stability and clarity of thought, not a verdict Deciding the Relationship's Future: A grounded decision either way, not a rushed one
Causes & risk factors
Infidelity is rarely a single, isolated event with a single cause, even though it often lands as one. In couples, it commonly follows a longer period of disconnection: unmet needs that never got raised directly, resentment that built quietly, or emotional distance that made an outside connection feel like relief rather than risk. In individuals, it can also relate to factors that sit apart from the relationship altogether, including impulsivity, unresolved personal difficulties, or an opportunity that arose at a vulnerable moment.
Prior experiences of betrayal, in this relationship or an earlier one, can also intensify the current impact considerably, which is why two people can experience what looks like a similar breach very differently.
What this means in practice: infidelity is not proof that you were never truly loved, or that you're incapable of loving well. It's a complicated human event with real causes worth understanding, not a verdict on either person's character.
How this shows up
Replaying details of the discovery or confession on a loop, sometimes for months
Checking a partner's phone, location, or whereabouts in ways that feel out of character
Sudden swings between wanting to fix things and wanting to walk away
Struggling to concentrate at work or feel present in ordinary daily life
Avoiding physical or emotional intimacy, or reaching for it as reassurance
Feeling like you have to perform "being fine" for people who don't know
Our treatment approach
We work with individuals and couples affected by infidelity, using an ACT-informed approach that makes room for the full range of what you're feeling, shock, grief, anger, even relief, without rushing you toward forgiveness, punishment, or a decision before you're ready. The aim is to help you think clearly again, grounded in what actually matters to you, rather than reacting purely from fear or pain.
Why ACT for this
It doesn't ask you to "move on" or forgive on a timeline that isn't yours
It builds tolerance for intense, conflicting emotion without needing to resolve it instantly
It keeps decisions anchored to your values rather than shame, panic, or pressure from others
What this looks like in sessions
Individual sessions to process shock, grief, or shame at your own pace
Joint sessions, where both partners want to understand what happened and why
Structured space to rebuild honest communication, if rebuilding is the direction chosen
Support separating "what I feel" from "what I've decided", so one doesn't rush the other
Practical work on trust, boundaries, and rebuilding safety, if the relationship continues
“"People often arrive wanting us to tell them what to decide. Our job isn't that. It's helping you think clearly enough to trust your own decision, whichever way it goes." — Clinical Lead, Eunoia Health”
What to expect: your first six weeks
Week 0 — Initial call to understand what's happened and who's attending: one of you, or both.
Week 1-2 — Individual or joint sessions focused on stabilising the immediate shock and emotional flooding.
Week 3-4 — Making sense of what led here, honestly and without assigning blame as the whole story.
Week 5-6 — Building tools for the conversations that matter, whichever direction things are heading.
Ongoing — Continued individual or couples work as trust rebuilds, or as separation is processed.
Review point — A joint check-in on whether the current focus and format still fit where you are.
Book a free 15-minute call to talk through whether individual or joint sessions make sense for where you are right now.
Frequently Asked Questions
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Either can work, and many people start alone before deciding whether joint sessions make sense. There's no requirement to attend together, and no assumption that you should.
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Yes. The intensity often eases, but there's no fixed timeline for processing a breach of trust, and needing longer than you expected doesn't mean you're handling it badly.
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Some do, genuinely and durably, though it takes honest work from both people. Others don't, and that's not automatically a failure either. Therapy supports you toward clarity, not a predetermined outcome.
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No. You'll be met without judgement, with a focus on understanding what happened and helping you make sense of it, whatever comes next.
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Individual sessions are entirely valid on their own. A lot of people process infidelity, and decide their next step, without their partner ever attending a session.
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It varies considerably depending on whether you're processing alone, rebuilding as a couple, or moving toward separation. Some people find real relief within weeks; others work through it over several months.
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Not at all. Most people start without a decision made, and use the sessions to get clearer rather than to justify a choice they've already made.
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Yes. Some people carry the impact of a betrayal long after the relationship ended or "moved on" on the surface, and that's still valid territory for this work.
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It draws on similar skills but focuses specifically on rebuilding trust and processing betrayal, which has its own emotional shape and pace compared with general relationship difficulties.
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No. We'll help you think clearly and honestly about what you want, but the decision about your relationship stays yours.
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Yes. Many clients find it easier to speak openly from home. Sessions are available online UK-wide or in person at our Horsham practice.
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No referral is needed. You can book directly with a BACP-registered therapist.

