Why do girls go for guys who are already in relationships?

Why do girls go for guys who are already in relationships?
  • Know a guy who is already in a relationship for a few years.
  • He and another girl only met each other for a few weeks, he would tease her and she would find him rude, but slowly seemed to feel comfortable with him.
  • They are now like buddies, chatting to each other casually and making fun of each other.
  • Girl would sometimes ask the guy if he was coming along or going home alr as though they've become good pals.

From what I've observed in other relationships as well, if the guy were to break up with his current girlfriend, then the new "good friend" will become his girlfriend. Are girls just waiting for it to happen?

Why do girls go for guys who are already in relationships?
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