Over thirty years ago, social psychologist Ronnie Janoff-Bulman studied the impact of trauma and how we view ourselves and the world. What she found is that people generally operate with a set of core, implicit assumptions. These underlying beliefs (which often exist beyond our awareness) can be seen as mental frameworks that help us feel safe, trust others, and navigate daily life.
She identified three core assumptions:
The world is benevolent. The foundation of this core belief is that people are generally good and life is fair. This assumption makes it easier to trust, form relationships, and believe that most people have good intentions.
The world is meaningful. Life seems to make sense when you hold this belief. With this assumption, things happen for a reason; events are not merely random or chaotic. There is the expectation of a clear cause-and-effect pattern to the happenings in your life: If I do X, I can expect Y to follow. This assumption helps us find purpose and allows us to feel a deeper sense of agency in our relationships and in the world at large. In short, we believe that we can influence outcomes through our choices and actions.
The self is worthy. At this center of this assumption is the experience that you are a good person who deserves good things. This assumption forms the foundation of healthy self-esteem and the self-experience that you are deserving of love, respect, and satisfaction.
On a daily basis, these assumptions impact how we experience ourselves, our relationships and our perceptions of events in the world. If, for instance, you had a relatively stable childhood and had “good enough” parenting—you were cared for, your basic needs were met, you were given opportunities to grow and flourish—you might have internalized one or all of these assumptions, even if you faced some hardships along the way.
It is in the face of repeatedly difficult experiences, or early traumatic events, however, that one or more of these core assumptions can shatter. When this underlying mental framework is significantly disrupted, your view of yourself, others, and the world can shift dramatically and become stubbornly negative.
And nothing shatters our basic trust in the world—particularly our relational world—like betrayal by the person we were closest to. Infidelity can puncture each of these core beliefs, not just about others, but about ourselves.
While these assumptions operate beneath conscious awareness, they become painfully obvious when disrupted. And nothing shatters our basic trust in the world—particularly our relational world—like betrayal by the person we were closest to. Infidelity can puncture each of these core beliefs, not just about others, but about ourselves.
How Infidelity Shatters Your Core Assumptions
Infidelity is a significant trauma that could negatively shape one or all of these assumptions, especially impacting how the betrayed partner may perceive the wayward partner. When the assumption about the benevolence of the world is shattered completely, you might now feel that people in general are opportunistic and untrustworthy. But within infidelity trauma, the shattering of benevolence might involve only your partner while you still hold a general sense in the goodness of people.
Here are how the three core assumptions might be negatively impacted after a betrayal trauma:
The Violation of Benevolence = “My spouse/partner isn’t who I thought they were”; “They are only concerned about themselves.”
The Violation of Meaning = “How could this happen to me?”; “It doesn’t matter how hard I tried to make this relationship work or how much love I showed, it was inevitable they’d cheat”; “It’s so unfair that they broke their sacred promise to me.”
The Violation of Self-Worth = “If this happened to me, what does that say about me?”; “If I was a good enough person for my partner, this never would have occurred.”
How Beliefs About Fairness Complicate Betrayal Trauma
I’ve sat with many people over the years as they try to make sense of infidelity. And I’ve noticed something that shows up time and again in the aftermath of betrayal: the collapse of someone’s belief in justice and fairness.
Initially, this may not be at the forefront of the betrayed’s pain. It doesn’t always show up as rage or blame. But as the infidelity recovery process unfolds and the intensity of one’s pain begins to subside, there remains a moral injury that cannot be easily shaken off.
It’s as if the wounded individual starts to question not only what happened, but what it says about the unfaithful partner and the world they thought they lived in.
The Rules We Thought We Were Playing By
Without even thinking about it, you may have held some version of the belief: “If I show up with love and loyalty, if I give my best to someone, they’ll do the same for me.”
You and your partner agreed to fidelity. There was a shared understanding and a commitment that you would each try to meet the other’s needs, that you would let these needs be known, and that the trust that was built would be protected and honored. While there may have been momentary complications that could make these commitments challenging at times, there was the shared understanding that your commitment would carry you both through during these difficult times.
These beliefs and shared understanding are what gave meaning to your union. They helped you make sense of the relationship and gave you a compass to guide you forward. They also imbued the relationship with a sense of fairness. That even in the face of bad days and bad moods, there would be attempts to prioritize the relationship at some point.
There is a deep injury of unfairness, of injustice. . .and the sense that some basic code was violated—that you played by the rules and still lost.
So when infidelity happens, it isn’t just the behavior that hurts. It’s what the betrayal shatters. The sense of coherence and making sense of the other is turned upside down. There is a deep injury of unfairness, of injustice. . .and the sense that some basic code was violated—that you played by the rules and still lost.
When We Can’t Make It Make Sense
We’re meaning-making creatures. After something devastating happens—especially in a relationship—we instinctively try to understand it. Not just what happened, but why.
Why me? Why us? Why did you cheat? What did it mean?
The answers the unfaithful partner offers are rarely satisfying. That doesn’t always mean they are being evasive or dishonest. Sometimes, the pain is just too deep, the rupture too severe for explanations to matter and bring comfort. The betrayal rips apart the shared story you both created—the assumptions, the agreements, the emotional contract you thought you were both honoring.
In the face of that kind of loss, even honest answers can fall flat. Early on, especially, no explanation feels big enough to hold the weight of what’s been broken. And so the mind keeps searching, turning the questions over and over, hoping they’ll eventually lead to something that makes the pain more bearable.
When Deservingness Turns Against You
There’s a cruel twist that sometimes happens after betrayal: the person who was wronged begins to question whether they somehow deserved or caused what happened. Not because they necessarily believe it rationally, but because they don’t know how else to make sense of it.
This is where the core assumptions start to work against healing.
If you believed that being a good partner would protect you from being hurt, then being hurt must mean you failed somehow. And so the mind tries to regain control by rewriting the story: Maybe I wasn’t attractive enough. Maybe I stopped being interesting. Maybe I made them feel unloved somehow. Maybe I…
And while these thoughts can give a temporary illusion of control (because if you can fix what was wrong, maybe it won’t happen again), they come at a steep cost: your self-worth, your dignity, your sense of safety in your own skin.
The Inherent Need for Justice
It’s not uncommon for betrayed partners to feel stuck in a loop of needing justice—needing the unfaithful partner to understand the pain, to express remorse, to make things right. And when that doesn’t happen in a satisfying or believable way, it can feel like another injury layered on top of the first.
This urge for justice may not be about vengeance. It’s about trying to reestablish some kind of moral, meaningful order. To bring understanding and the rules of fairness and justice back into the relational fold.
Because if there’s no justice—no real recognition of the harm done—then the world can start to feel unlivable. Unsafe. Random. And the person who was betrayed is left holding the pieces of a story that no longer makes sense.
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At its core, betrayal trauma leaves more than emotional devastation. It ruptures the foundational ways in which you make sense of your world—how you understand your partner, your relationship, even yourself. Infidelity trauma feels inherently unjust because of the profound breach in trust and commitment. These weren’t just promises; they were the cement you built your life on.
The search for the “why” behind the infidelity—a question so many betrayed partners wrestle with—is often an attempt to bring order to post-discovery heartache and chaos. If there’s a reason the affair occurred, then maybe this wasn’t just arbitrary or cruel. And maybe, if the underlying causes are addressed, healing and the restoration of trust might become possible.
But repair cannot happen unless the wayward partner acknowledges the injustice in what they’ve done. Without that recognition and without genuine and sustained efforts to atone, the damage to the betrayed’s worldview may persist, even after significant emotional processing. Time and effort alone aren’t enough if the moral injury remains unaddressed.
For healing to take root, the betrayed partner must also ask: Am I struggling with a moral injury? Is the pain not just emotional, but also existential—a deep wound to my sense of justice, safety, and meaning?
Naming this can be the first step in restoring what was fractured.
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Rich Nicastro, PhD, is a clinical psychologist with over 25 years of experience supporting individuals and couples as they navigate betrayal trauma and other emotional challenges. He offers teletherapy to clients throughout the United States. To work with Dr. Nicastro and join his waiting list, please email him at Rich@RichardNicastro.com.
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Reference
Janoff-Bulman, R. (1992). Shattered assumptions: Towards a new psychology of trauma. New York, NY: Free Press.
