From a neuroscience and psychological perspective, people who live with someone who is still married are often operating under a mix of emotional reward loops, cognitive bias, and attachment wiring.

Here’s what’s really happening in the brain:

🧠 1. Intermittent Reward = Addiction-Like Bonding

When someone is emotionally or physically available sometimes but not fully (because they’re still married), it creates an intermittent reinforcement loop.

The brain releases dopamine (reward chemical) during the “good” moments. But because those moments are unpredictable, the brain becomes more fixated—not less.

This is the same mechanism seen in gambling addiction. Uncertainty strengthens attachment.

🧠 2. Cognitive Dissonance (Mental Conflict Reduction)

The brain doesn’t like contradictions, so it tries to resolve them.

Example conflict:

“This person is unavailable” “But I’m investing my life in them”

To cope, the brain rewrites the narrative:

“They’re just going through a phase” “It’s complicated, but we’re the real relationship” “They’ll leave eventually”

This reduces stress short-term—but keeps someone stuck long-term.

🧠 3. Attachment System Activation

If someone has an anxious attachment style, this dynamic can feel strangely familiar and even addictive.

Inconsistent availability = heightened emotional focus The brain interprets this as importance rather than instability

So instead of pulling away, they lean in harder.

🧠 4. Scarcity Effect (Perceived Value Increases)

The brain assigns higher value to things that feel limited or hard to obtain.

“I can’t fully have them” → increases obsession “They chose me despite being married” → boosts perceived specialness

This activates reward circuits tied to status and validation.

🧠 5. Oxytocin Bonding Overrides Logic

Physical intimacy and emotional closeness release oxytocin (bonding hormone).

This creates a sense of trust and attachment Even when the situation logically signals risk or instability

So the body feels “safe” while reality is actually unstable.

🧠 6. Future Projection Bias

The brain is wired to imagine future outcomes—and often overestimates positive ones.

“Once the divorce happens…” “When things settle…”

This keeps people invested in a potential future rather than the current reality.

🧠 7. Identity & Self-Worth Loops

For some, this dynamic ties into deeper self-perception:

“If they choose me fully, it proves my worth” “I must be special if they risk everything for me”

This can create a powerful emotional hook that’s hard to break.

⚖️ The Reality Check (Brain vs Reality)

From a purely neurological standpoint:

The brain is being stimulated, not stabilized The relationship often runs on dopamine spikes, not secure attachment

That’s why these situations can feel intense, addictive, and meaningful—but also draining and uncertain.

💡 The Bottom Line

People in this situation aren’t “foolish”—their brains are responding exactly as they’re wired to:

chasing reward reducing discomfort attaching under uncertainty

But the same wiring that creates the high also creates the trap.