I agree with here2play, you are either having or developing a oneitis. If you had a abundance of hot girls in your life you wouldn't be hung up on this one like this. But I'm not here to judge, cos' I'm guilty of the same things.
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i just need to know what to do with a girl that has a boyfriend.
For me if a girl has a BF, and she still goes with me, it means the relationship wasn't healthy for her or wasn't fulfiling. If she loves him beyond grave, there is nothing I could ever do or say to get her. And neither could the best pickup artist in the world.
What I would recommend is no more question asking like "Do you want to kiss me"? or "Do you want to be my date for tonight" or whatever. Just take lead. Be in charge. Go for the kiss and if she deflects just smile and try again a while later. Women love men who are dominant, who take what they want and not ask too many questions. (It is not to say that you should ever force yourself on her of coruse)
If there is one thing that helped me to get good with girls it was this. Being leader in almost any situation, not trying to impress her (or others) in any way shape or form, not being ashamed of the fact that I want her (and other girls as well), not being ashamed that I want sex with her and being extremely open and honest about it all.