I like a girl who has a boyfriend.?

I fell in love with this amazing girl. She's everything I am looking for. One day I told her I like her, and she admitted she likes me too. The problem is she has a boyfriend. we've been hanging out a lot lately. She went four wheeling with my family and I, and I go to her house and hang out sometimes. She told me her boyfriend and her aren't doing too well together. like her boyfriend wants to do "stuff" she doesn't, and he seems to have more interest in other people then her. she said she feels like she's a burden to him. She says she's more happy when she's with me, but she loves him and wants him to be happy. I want them both to be happy. Me and her talked tonight and she said she's going to try to work things out between them two, but I don't think it will. I just don't know what to do. should I stick around and wait for her, or should I move on? I can't stand being away from her, and I can't stand to be with her because we can't be more than friends.