Welcome to the uncomfortable truth about infidelity that nobody wants to admit: when two people who are actively betraying their partners decide to start a relationship together, they’re not beginning a love story, they’re entering what I call a Mutual Vetting for Dishonesty (MVD) Agreement.
As a sexologist who has counseled countless couples navigating the aftermath of affairs, I’ve witnessed this pattern play out with almost comedic predictability. The relationship dynamic that emerges when “the cheater” and “the other person” decide to make things official is less romantic comedy and more psychological thriller.
Let me paint you a picture of what honest self-disclosure would look like in these situations—if people were brave enough to tell the truth from day one.
The Brutally Honest First Date (If They Were Actually Truthful)
Imagine this speed-dating scenario for the ethically compromised:
Dan (The Serial Sneak) Speaks First:
“Hi, my name is Dan. I’m currently married and actively deceiving my wife. By meeting you here tonight, I’m showing you exactly who I am: a man who prioritizes immediate gratification over integrity. I’ve developed sophisticated systems for lying and compartmentalizing my life, and right now, you’re the beneficiary of these skills.
Moving forward, you can expect me to be precisely who I’ve demonstrated myself to be. I’m capable of maintaining complex deception, and when our inevitable conflicts arise, these are the exact tools I’ll use again. The system of dishonesty is the most loyal thing about me.”
Celeste (The Chaos Coordinator) Responds:
“Nice to meet you, Dan. I think we’ll get along great—we have so much in common! I’ve been in an on-again, off-again relationship for years. We’ve broken up at least five times, we stalk each other’s social media, and I’ve definitely gone through his phone more than once.
If you and I move forward together, here’s what you can expect: I will violate your privacy regularly because my baseline assumption is that you’re untrustworthy (which, fair enough, you are). I’ll threaten to leave every time we have conflict, because I don’t do healthy boundaries—I do validation-seeking and control. You’re a high-value, high-risk asset that I will desperately attempt to secure and monitor 24/7.”
The Punchline
Congratulations, Dan and Celeste! You’ve just transparently disclosed your relationship operating systems. Now, when your partnership implodes exactly as predicted, please don’t act surprised.
The Psychology Behind Why It Fails: Two Fatal Myths
When a cheater and someone who willingly engages with a cheater pair up, they’re unconsciously signing a contract based on two fundamentally flawed premises:
Myth #1: The Magical “Switch” That Never Flips
The Delusion: Both parties believe that the moment they transition from illicit affair to legitimate relationship—when Dan leaves his wife, when things become “official”—the psychological mechanisms that enabled the betrayal will simply… turn off.
The Reality for Dan: The skills he demonstrated throughout the affair—lying, emotional compartmentalization, betraying core commitments—aren’t situational tactics. They’re his established relationship tools for managing conflict and desire. These are his most successful coping mechanisms. Why would he abandon them when the new relationship hits its first major roadblock?
The Reality for Celeste: Her behaviors—snooping, surveillance, trust violations, threatened abandonment—aren’t reactive to Dan’s infidelity. They’re attachment strategies rooted in profound insecurity. She chose Dan knowing he was actively betraying someone else. Her baseline expectation is confirmation of betrayal. Her monitoring behavior is an attempt to control the inevitable.
Myth #2: The Mirror Always Reflects Back
The person who accepts the role of “the other woman” or “the other man” often believes their status as the “chosen one” elevates them above the person being cheated on. In reality, they’re simply holding up a mirror to the cheater’s core nature—and that mirror inevitably reflects back onto their own relationship stability.
The Transformation: From Fantasy to Dysfunction
Here’s how the dynamics shift from the thrilling affair phase to the dysfunctional relationship phase:
| Dynamic | Initial Excitement (Fantasy Phase) | Long-Term Reality (Functional Relationship) |
|---|---|---|
| Trust | “They’re willing to risk everything for me—I must be special!” | “They’re willing to risk everything, including me, for their own immediate needs.” |
| Commitment | “Our bond is so powerful it survived secrecy and social judgment.” | “Our bond is fundamentally unstable because it was founded on deception and boundary violations.” |
| Power Balance | Dan feels powerful because he’s intensely desired; Celeste feels powerful because she was chosen. | Dan is perpetually monitored and restricted; Celeste lives in constant fear of the next competitor. The relationship becomes a mutual prison. |
| Conflict Resolution | Intense, passionate makeup sex after secret fights. The drama feels like passion. | Conflict defaults to hyper-monitoring (Celeste’s strategy) or avoidance/lying (Dan’s strategy). Neither builds intimacy or trust. |
The Behavioral Evidence: What the Research Shows
Relationship psychology research consistently demonstrates several key findings:
- Past behavior is the strongest predictor of future behavior – Infidelity patterns typically repeat because the underlying psychological drivers (need for validation, fear of intimacy, conflict avoidance) remain unchanged.
- Relationships that begin as affairs have higher dissolution rates – Studies show these partnerships are approximately 75% more likely to end within the first five years compared to relationships that began without infidelity.
- The “mate poaching” paradox – Individuals who successfully “steal” a partner from someone else report significantly higher levels of jealousy, mistrust, and relationship monitoring in their subsequent partnership.
The Sexologist’s Verdict: You Get Exactly What You Selected For
Dan and Celeste, having essentially confessed their true behavioral patterns right out of the gate (even if only implicitly through their actions), shouldn’t be shocked when their relationship plays out like a predictable psychological thriller.
They found exactly who they were looking for:
- Dan found: Someone who would accept and enable his compartmentalized, avoidant approach to conflict and commitment
- Celeste found: Someone whose behavior confirms her core belief that partners cannot be trusted, giving her permission to engage in controlling surveillance
The relationship becomes a self-fulfilling prophecy. Dan’s secrecy skills and Celeste’s surveillance tactics lock them into an exhausting dynamic where neither can feel safe, seen, or secure.
Can These Relationships Ever Work?
I won’t tell you it’s impossible, humans are complex, and people do grow and change. However, for an affair-originated relationship to become healthy and sustainable, both partners must:
- Undergo intensive individual therapy to address the core psychological drivers of their behavior patterns
- Take full accountability without blame-shifting (“I cheated because my marriage was dead” or “I pursued you because you seemed available”)
- Rebuild trust through radical transparency over an extended period (typically 2-3 years minimum)
- Accept that the relationship may still fail despite their best efforts
The brutal truth? Most couples who start this way don’t do the work. They repeat the pattern instead.
Red Flags You’re in an MVD Agreement
If you’re currently in a relationship that started through infidelity, ask yourself:
- Does your partner maintain secretive behaviors (password-protected everything, defensive about their phone, unexplained absences)?
- Do you feel constant anxiety about being replaced or betrayed the same way their ex-partner was?
- Is there an ongoing pattern of threats, surveillance, and control disguised as “caring”?
- Do conflicts escalate quickly because neither of you has healthy communication or de-escalation skills?
- Is there an absence of accountability for the original betrayal, with justifications instead of remorse?
If multiple red flags are present, you’re not in a relationship, you’re in a dysfunction feedback loop.
The Bottom Line: The Foundation Matters
Here’s what I tell clients in my practice: The foundation of a relationship predicts its structural integrity.
When you build a house on quicksand, you shouldn’t be surprised when it keeps sinking. The same applies to relationships built on:
- Active deception
- Boundary violations
- Betrayal of existing commitments
- Selection for dysfunction rather than compatibility
Dan and Celeste’s story isn’t unique, it’s archetypal. And the punchline? When they eventually end up in couples therapy trying to figure out why their relationship feels like a prison of suspicion and lies, the answer will be devastatingly simple:
You each got exactly who you chose. And you chose based on red flags, not green ones.
Take the Next Step
If you recognize yourself in this dynamic and want to break the cycle, consider:
- Individual therapy with a specialist in attachment and relationship patterns. You can also schedule a consultation with me
Remember: You deserve a relationship built on trust, transparency, and secure attachment—not surveillance and suspicion.
