Well, it's bad karma messing with someone a friend is interested in, but from reading your post, seems like he didn't have a chance in the first place. If he's slamming doors over a girl he's known for three days, he needs to get some anger management anyway.

In response to the question, whether it's wrong or not is debatable, but I don't think you need anybody to tell you cheating on your wife isn't scoring many morality points.

Entertaining post, but you're going to get a lot more readers if you separate them into paragraphs.