So there is this guy I REALLY like. He always been dumped by his girlfriends, so I would NEVER break up with him. The problem is that my friend who is dating his best friend likes him, My friend and her boyfriend sont seem like they are going to last. Should I ask him out before she gets to him or should I respect the girl code ? And I don't know. I can't ask him out though, I'm too shy. If I were to do it , how would I ? :/

Don't ask him... someday you will breack up with him you can find over 100 other boy !
But your friend you can't replace her!
Move on ! Meet new people you will find the perfect guy that's for sure :)