My boyfriend has been cheating with his best friends girl so I told him,was I wrong in telling him?

It would have been wrong if he was your friend instead of boyfriend. But he is your boyfriend and that means he is cheating on you as well as his best friend. Why don't you directly ask your boyfriend about this?

Why is he still your boyfriend?

Why is he still your boyfriend?

Right... are you broken up with him yet?

The way I see it... you told your boyfriends friend about the cheating so that the friend could put a stop to it but you're still going out with the guy that was doing it to begin with, right?

I think you did it to get back at your boyfriend. I think it was wrong because this should have been between you and your boyfriend not the other guy. Are you still dating this cheater?

If you have not broken up with your boyfriend, yes it was totally wrong.