I Am So Lost And Stuck, I Have No Idea What To Do.

I'm only in high school but I thought I found someone I truly love and want to be with. We have been on and off since I was 15, but we officially, after countless arguments everyday, have decided to end it for good last January (2012). All throughout the summer she was fighting to be with me claiming it was a mistake. All last year she tried to win me back, but I DID get over her and didn't want the drama in my life so I didn't talk to her. Just before school started, we did start talking again and she made me like her, but I didn't fall hard. We did things and I just grew attached to what we did, not for her actual self. I guess I just liked the company of what we engaged in. It's now February. More than one year since we we went out officially. Now, she's showing feelings that she doesn't want to be a "thing"anymore. She doesn't want to deal with all the drama I caused her. But honestly, I don't want to let her go. Yes, she ****** me off more than anything in the world, and I can't stand her 5 days out of the week. But those days I do stand her, and those times we are together, I'm so happy, and she is too. But the situation is so complicated that we just can't figure out if we actually want to be together or break off everything that has been going on in the past three years. When is it time to move on? I truly thought I would be marrying this girl. But the stress, drama, fights, and crying have torn us to pieces and it isn't healthy. What should I do please help!