Just read this (funny, wasn't looking for it, just a random article) and wanted to remember it...

Quote:
Their significant other has left the scene in order to play out his idea of a relationship with a fresh person. It will be the same idea of the way he feels a relationship should go, just with a different person. This includes cheating on the new individual the way he did with the former. Men don’t cheat because the other person drives them to it – they cheat because they want (or even need) to in order to fulfill their model of what a relationship should be. (Games People Play, a popular book from the 1970s which breaks down the “mind games” that people play with each other, would have described it as living out their “script.”)