she is not worth your time. believe me. end it forever now and don't look back. you don't want to be a part of that. she is also only 15. she still has maturing to do and her opinions will be changing on a lot of things, maybe even her feelings for you. this is what you should do. don't talk to here or be in contact with her in any way for at least 6 months. otherwise you will keep feeding those feelings that you have for her. you are in college. have fun. go to parties. make out with random girls, try out the whole fuck buddy thing. if you are single when you graduate college, and you still think you might have feelings for her then look her up.