Ask him "Is she/one of these your girlfriend?" If he is in the vicinity of one or more females, his girlfriend will answer for him.
If he is alone and you are a "do-able" female and ask if he has a g-friend, he will always say "no".
If he is alone and you are not a "do-able" female, he will always say "yes".
If you are male and straight, you don't care so you won't ask. Real men don't care if another guy has a girlfriend.
If you are male and homosexual and ask him, he will say "Yes" if he is homophobic.
If you are male and homosexual, he will tell you the truth if he is a real honest person.
That about covers most of the situations. The sexual preferences of the females asking the guy the question is usually irrelevant because most guys consider all females want him/them.
1st tell him to stop and then it dosnt matter if you like his girlfriend or not tell her
you can tell him, or his girlfriend if you are friends with her
You shouldn't have done anything with him knowing he has a girlfriend.
Go to the guy and tell him to tell his girlfriend that he has a crush on you and that he thinks they should get over each other.
You don't.
tell his girlfriend
you go up to the guy and tell him you dont mean this in a bad way but you think that his girlfriend is no good for him
If a guy likes you he will turn around and look in your eyes.
Just tell him to break up with his girlfriend and you guys can get together
tell his girlfriend and all your Friends so everybody can know how much of a jerk he is
if he is truly happy around his girlfriend and will do anything to be with her
ask him