What Actually Counts as an Affair?
People often ask me, "What counts as an affair?"
It sounds like it should have a simple answer.
It doesn't.
One couple may consider flirting a betrayal. Another may not. Some relationships are monogamous. Others are consensually non-monogamous. Every relationship has its own agreements about exclusivity, intimacy, and transparency.
So if every relationship is different, is anything universally true?
Yes, there are a few themes that show up over and over again.
It's usually not about another person. It's about the relationship you've created with them.
One of the biggest misconceptions I see is that people assume affairs are defined by a specific behavior.
They're not.
Simply having a close friend isn't automatically an affair. Working closely with someone isn't automatically an affair. Feeling attracted to another person isn't automatically an affair. Even having strong emotional intimacy with another person isn't necessarily an affair.
The more helpful questions are:
Has this relationship become more emotionally or romantically significant over time?
Has the nature of this relationship changed without prior discussion or consent?
Has secrecy or deception entered the relationship?
Has this connection started competing with your primary relationship?
Has it crossed the agreements you and your partner made?
What most affairs have in common
There isn't a single, universal definition of an affair. What one couple experiences as a profound betrayal may not violate the agreements of another relationship. In that sense, whether something constitutes an affair is, to some degree, relationship-specific.
That doesn't mean "anything goes." Most clinical models of infidelity share common themes: emotional, romantic, or sexual behavior that occurs outside the relationship's agreed-upon expectations and results in a breach of trust. While every relationship defines fidelity a little differently, most affairs involve violations of relationship agreements, deception, or both.
Deception is incredibly common. Hidden conversations, deleting messages, minimizing the significance of a relationship, lying about contact, or protecting a connection from your partner's awareness often become just as painful as the affair itself because they undermine trust and leave the betrayed partner questioning what else they don't know.
But deception isn't required for something to be a betrayal. Someone might try and openly pursue an emotional, romantic, or sexual relationship without their partner's mutual agreement or informed consent. While nothing is being hidden, the relationship agreements have still been violated.
Likewise, not every secret is an affair. Planning a surprise party or protecting a confidential conversation isn't necessarily a betrayal of fidelity. So secrecy itself isn't what defines an affair.
For one relationship, violating an agreement may mean having a sexual relationship with someone else.
For another, it may mean developing a romantic attachment that gradually replaced turning toward one another.
For another, it may mean maintaining ongoing contact with a former partner after agreeing there would be none.
In consensually non-monogamous relationships, it may involve secret partners, breaking safer-sex agreements, or violating other negotiated agreements.
The specific behaviors may differ from one relationship to another, but the common thread is the same: a breach of trust that occurs when relationship agreements are violated.
Affairs aren't defined by monogamy.
One of the biggest myths about infidelity is that affairs only happen in monogamous relationships.
They don't.
People in consensually non-monogamous relationships- including open relationships and polyamorous relationships- also have agreements. Those agreements may look different from a monogamous couple's, but they are still agreements.
Having another partner isn't automatically an affair in those relationships.
Hiding another partner might be.
Breaking safer-sex agreements might be.
Developing a secret relationship outside the agreed structure might be.
In other words, affairs are possible in every relationship structure because betrayal isn't defined by the number of partners. It's defined by deception and broken agreements.
Why this matters
From an attachment perspective, affairs aren't just about sex or romance.
They're about trust.
When someone discovers that an important relationship has been hidden, minimized, or misrepresented, it can fundamentally change how safe they feel with their partner. That's why many people experience betrayal as deeply destabilizing, regardless of whether the affair was emotional, physical, or both.
Conversations worth having before there's a problem
Many couples assume they're operating from the same definition of fidelity.
Often, they're not.
Some conversations worth having include:
What does faithfulness mean to each of us?
What agreements are most important in our relationship?
What would each of us consider an affair?
What makes a friendship feel safe? What makes one start to feel unsafe?
How do we want to handle attraction to other people?
What does transparency look like for us?
These conversations aren't about controlling each other.
They're about building shared expectations before misunderstandings become injuries.
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Looking for More Support?
Learning about relationships is one thing. Having these conversations is another.
If you're looking for practical tools to help you navigate trust, boundaries, communication, and betrayal, explore my therapist-created guides and worksheets designed to help you take the next step.
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If you're finding these conversations too difficult to navigate on your own, or if trust has already been broken, couples therapy can provide a structured space to better understand what happened, strengthen communication, rebuild emotional safety, and determine whether repair is possible.
I use Emotionally Focused Therapy (EFT) and the Gottman Method to help individuals and couples navigate betrayal, trust, attachment, and relationship repair.
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About the author
Alice Grutman is a licensed couples therapist serving clients in California and Washington. She specializes in betrayal recovery, trust, attachment, and relationship repair, helping individuals and couples navigate affairs, emotional affairs, and other relationship injuries with honesty, accountability, and compassion.
Drawing from Emotionally Focused Therapy (EFT), the Gottman Method, and current relationship research, Alice helps people move beyond blame to better understand what happened, rebuild safety, and decide what comes next.
Through her writing, Alice makes complex relationship science practical and accessible so readers can better understand their relationships, have difficult conversations with greater confidence, and build stronger, more secure connections.