How do I get over her?

So I met and started talking to this girl at school in January and we were good friends who talked and hung out quite a bit but I'd rarely see her at school. I was always flirting with her and she would always be touching me, we had a good friendship but we weren't going out. I really wanted her and she knew it but I was never sure if she liked me back because she would sometimes ignore me but she would cuddle me (pretty sexually) and take a nap in my bed with me twice. She told me that she doesn't want a relationship of any kind but I didn't care I still was chasing her. So everything was going good with us until a few weeks ago she just started ignoring me and stopped asking me to hang out. I have no clue what happened but every time i see her now she acts like she doesn't want to talk.

And after not speaking to me for 2 weeks she calls me at night and says she wants to chill then cancels. Why would she do that? I asked her a few days later if she wanted to hang out but she ignored it. We haven't talked in so long it's killing me, I don't know what to do I miss her so much. I can't get over the fact that we don't talk anymore, I cared for her a lot. Why would a girl just end a great friendship like that?