They don't need another person. They need another hit. Have you ever looked at someone's life and thought, they have a stable relationship, a beautiful family, a great career? So why would they risk all of it? Because they aren't chasing another person. They're chasing a feeling. The chase, the flirting, the secrecy, the uncertainty. Here's the psychology. Dopamine isn't a chemical of happiness. It's the chemical of anticipation. Your brain releases it, not because you have something, but because you might get something. That's why the fantasy can become more addictive than the reality. The next text, the secret conversation, the thrill of almost getting caught, the brain begins craving the anticipation more than the person. Over time, peace can feel flat, not because love is boring, but because the brain has been conditioned to expect intensity. That's why someone can have everything and still risk losing it all. The affair, the constant flirt...
Talking to experts is a common way to gain a lot of information about a topic quickly. Experts can combine the amount of knowledge that is not properly understood into layman's rules that are much easier to understand than the analytical model or other form of relational behavior.