Need to Get Over This For Good

Okay, well, here I go. It all started I guess in 7th grade. Her name is Kristen. We went out for a month. Middle School crush, no big deal. The following year I dated another girl for 7 months. After me and this other girl broke up, I had started talking to Kristen, just as friends. She told me that she was jealous the whole time me and that other girl dated. So, we tried it, but I broke up with her because my parents didn't like her. So, we continued to like each other the whole school year, then I finally talked to my parents about it. They changed their mind about Kristen. So, since that point, a little over a year ago, we have tried it numerous times. Never works. She is so into it, but then she says she doesn't want anything serious. But then she comes back saying she was a heartless bitch, and I always fall for it. So, bascially we have had feelings for each other for almost two years, actually more since she still like me when I dated that other girl. I always get down when we end it because I'm into it and she always acts like she will be too. I keep going back cuz I think if we have liked each other this long, then it is meant to be, maybe not forever, but for a good while. She makes me happy, but I hate it when she gets my hopes then just crushes them. I know she has feelings for me, she just isn't good with relationships. I want to get over her for good. We will always be friends, but I wanna get over this and talk to her without those feelings popping back up to screw me over. I know she has strong feelings, but she can't handle a relationship and doesn't want to try. I know this sounds immature, but I need help. My friends and family understand but they tell me I can do better. I just need help because I want to get over this so so so bad.