Betrayal Trauma and Infidelity: What Therapists Need to Know

When couples come in after an affair is revealed, the presenting issue is often labeled simply: infidelity.

But what sits underneath that word is much more complex – and much more painful.

It’s not just about sex.
It’s not only about deception.
It’s about a unilateral decision to blow up what was previously a mutual decision. This is why some couples call it betrayal trauma.

In the Developmental Model®, we don’t view infidelity as a singular “event” with a simple cause.

However, it usually results from developmental regression – a retreat from differentiation, from emotional honesty, and from the hard work of staying connected through very challenging emotional conflicts or impasses.

Infidelity often occurs when a partner avoids the vulnerability required to evolve. When one partner chooses to lie or hide, they’re not just betraying trust – they’re breaking the implicit agreement to grow together. That’s what makes it so destabilizing.

The hurt partner is experiencing a level of betrayal trauma.
They aren’t just grieving the act.
They’re grieving the loss of shared dreams, goals and fantasies of what the couple could create together.

And when the betraying partner minimizes the pain, or avoids answering deeper questions, the traumatic feelings intensify.

Here’s what repair requires:

  • A clear, non-defensive acknowledgment of the betrayal
  • Willingness to examine and articulate why the betrayal happened
  • Capacity to tolerate guilt without collapse or withdrawal
  • Commitment to rebuilding transparency – one vulnerable action at a time
  • Accountability by both partners
  • New informed agreements and commitments

Infidelity is about more than sex or breaking agreements. It breaks the container of growth. And the work of repair is about much more than honesty and accountability. It’s the challenge of rebuilding that container. It means each partner showing up with much more courage than existed before.

Not every couple makes it through.
But the ones who do?
They don’t just “move on.”
They grow up.
They grow together.

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Michele
Michele

Beautiful articulation of betrayal trauma! I will definitely be sharing with my couples clients. Thank you!

Matsie Matooane
Matsie Matooane

A very painful trauma to work through – awesome to journey with and bear witness of the courageous couples who successfully rebuild the container! One couple at a time…

Colette Golden
Colette Golden

This works beautifully with couples who truly want to find a way forward and the rewards are immeasurable.

Marilyn Lowry
Marilyn Lowry

Brilliant description of betrayal. I never really understood the depth of the action. It cannot be treated as a superficial act; it is a much deeper chasm to bridge! Thank you!

X Betrayed partner.
X Betrayed partner.

Betrayal therapy. What about when the partner who is betraying does it long term, with great planning, the secrecy really harms the family, is not contrite.

Keri Cleverly
Keri Cleverly

Thank you Ellyn for the brief and comprehensive depiction of all the aspects of betrayal recovery. You mentioned one aspect of recovery work that I’m finding to be essential with betrayers…. they have to do the work to explore WHY they cheated. If that work is not done, the betrayed ( and the betrayer) never feel safe that it won’t happen again .

Jeannette Samper
Jeannette Samper

Having experienced betrayal in my marriage and feeling/experiencing that no one… not even my therapists understood or dealt with the topic I find your description of betrayal trauma that puts into words what was happening to me and also gives me a path to understand several couples I’m now working with as a therapist. Thank you Ellyn for sharing so much clairty and wisdom!!

Caroline Corwell
Caroline Corwell

Love This ❤️👏👏👏

Grace Achoki
Grace Achoki

Thank you very much. This is very helpful. I like the analogy of the broken container of growth and fixing it together.

alvinlees
alvinlees

It is amazing how quickly Dr. Excellent brought my husband back to me. 

Dr. Ellyn Bader

Dr. Ellyn Bader is Co-Founder & Director of The Couples Institute and creator of The Developmental Model of Couples Therapy. Ellyn is widely recognized as an expert in couples therapy, and since 2006 she has led innovative online training programs for therapists. Professionals from around the world connect with her through internet, conference calls and blog discussions to study couples therapy. Ellyn’s first book, "In Quest of the Mythical Mate," won the Clark Vincent Award by the California Association of Marriage & Family Therapists for its outstanding contribution to the field of marital therapy and is now in its 18th printing. She has been featured on over 50 radio and television programs including "The Today Show" and "CBS Early Morning News," and she has been quoted in many publications including "The New York Times," "The Oprah Magazine" and "Cosmopolitan."

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