i think this happens to just about everyone.... If you are prepared to have your heart broken, then continue doing what you are doing and enjoy the love-making (sex), but be prepared for her to drop you like its hot at any moment cause thats the type of girl she seems like.
its difficult I know cause you fell for her, but If you really want her, then dont talk to her anymore, for some odd reason a lot of girls come chasing you when you dont show any interest, and when you do, they blow you off.... i dont know why, but they do...
goodluck
PS you should play some games with her too then and tell her you have someone else in your life... see how she reacts...play some hardball with her!
