Do I still have a chance going on with her?s (Guys, your valuable advise will be much appreciated)?

Alright, there's this girl i'm in love with for 2 years, but she's attached but I decided to wait. She told me she's with her bf for almost 5 yrs now. But her relationship wasn't going good. Her bf was being unfaithful to her before by going on with another girl, but that was in the early stage of her relationship. She had also told me, they broke up and patched back many times. They quarrel frequently. Sometimes, she'll say she wants to brake up with him, but he wouldn't allow her to leave him. She always tell me he's possessive and controls her a lot. Last year may she started liking me. At first she didn't like me and told me to find someone else. That was like 2 years back. She had on and off feelings towards me. She'll say she's confused about me and her bf won't leave her. I cared so much for her. She has a painful past too with him. She has hurt me so many times by asking me to move on many times even after she told me she feelings for me. Once she told me, she wants me and don't wanna lose me. Then, this year February, she told me, she had enough of me. She has made up her mind, she loves her bf and wants to marry him no matter what happens. She blocked me from her msn, told me not her text her anymore and bother her and she'll not bother me again too and she told me to get lost from her life. Then recently, a month after what she said, she unblocked me from her msn and started chatting. She told me why she came back talking to me its because we ended up in the same school. We might even end up in the cl because we got into the same course of study and we're both turning 19 this year. We started talking back normally. but she gets angry whenever I talk about the past. I don't get it, she told me she was firm not talkig to me anymore. Even if we ended up in the same school or cl, she could have just not bothered or cared coming back to talkin to me again right? She told me she's still keeping my gift that I gave her during her birthday. It's a very sweet simple gift that I made it with ny hands and she really likes it. She is still with her same old bf actually. Now, im just confused why is coming back talking to me. She still knows I have feelins for her and I love her. Even knowing that, why she comes back talking to me? Does she still likes me or have feelings for me?? I still do love her even after hurting so much.. Plz help me with this!