B.I.L.B.: Stealing best friends' girl/boyfriends

I think that, stealing your best friend's boyfriend is wrong, because you win a boyfriend but you also lose your best friend who you know ever since. But if you do not lose the boy you win more confidence with your friend. If he isn't her boyfriend, it doesn't matter, like in the movie where the coacth and Jules weren't together and Jess doesn't do anything wrong.

Maria