First off I just want to let you know that you cant force her to leave her man. She has to have very strong feelings for you and it has to be her choice. It all depends on what your relationship with her is like and if she is willing to risk loosing the one she is with for you. The best thing to do is too let her know how you feel about her so that your feelings are out in the open and also so that she knows she has the option of leaving her current boyfriend if she chooses. At that point all you can do is wait and see what happens.From exoperience I can assure that it is not easy to choose between two men who have feelings for you. Good luck.
It may be hard to do, but always talk to her... if she doesn't like you or doesn't feel right about the situation leave her alone and find someone better:D
Leave your cheating boyfriend... Seriously, put yourself in the other girl's shoes. Tell him if he really wants to be with you, he'll leave the other girl.
If the girl has a boyfriend already,try not to get in the way. If she really does love you then she will break it off with her boyfriend. Don't try to rush her though as girls don't like that. Trust me, I am one.
What the hell, are you TRYING to get her in trouble? Leave her alone before her boyfriend comes out with the gun.
Probably not the answer you want to hear but - leave them alone ! As you said, she's already in a relationship, and it's not your place to interfere.
If you know she isn't happy with the relationship she is in now. Then be really nice to her better then her boyfriend. But if you know she is happy and loves her boyfriend just be friends or leave her alone. Girls don't like it when you are annoying and try to take them away from the person they love. But if you don't know at all i think its better to just be friends or leave her alone.
If she has a boyfriend, leave her alone.
Treat her better than her boyfriend does.
welltry and be friend with her and if you like her tell how you feel then if she breaks up with him there you go
You can't.
Tell you her your feelings about her
That's NOT Cool man.