You leave him alone until he is not attached.
If you like a guy and he has a girlfriend then you should back off and only try and be his friend.
Well if they are straight then they don't like other guys. But you can tell if a guy likes another guy if they look at them like a straight guy would look at a chick.
If the boy has a girlfriend, find a guy that doesn't have a girlfriend.
wait
Mitchel Musso is straight. he has a girlfriend named gia or something like that.
BE YOURSELF!!!
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He has a girlfriend. So you butt out. It's not complicated.
you use his girlfriend like a ladder and jump over him
Well, its ok for them to hang out. If you trust her, then yes, if not then go with her. Like a double date.
Spy on him! A wife caught a guy redhanded giving nude photos of himself to his girlfriend.
You shouldn't flirt with him if he has a girlfriend.