I like him, but he has a girl friend! What do I do?!?

I like this guy. He is friends with the neighbor and I really have found myself liking him. He has a girlfriend and I know it sounds really raunchy to try and take some girls man but as far as I can see he is only with her because she will kick him out if he doesn't. She goes out every night and goes to clubs while he just sits at home. I know that really isn't my business but it is just to verify i am not just trying to take a guy from his girlfriend because I am mean or something. I need to know how to get him to see me more as a girl friend and less of a friend. I have never in my life tried to take a guy away from another girl but I really like him and think he deserves better than that girl. Any suggestions on how to make him mine??