Can't get over a person

My story is some "500 days of summer" stuff, if you've seen the movie. I fell in love with a girl I met in college. I knew from the very beginning it was unrequited feeling but I just completely lost my mind for her. After a year of so called "friend-zone" something changed, we got closer and eventually we were together for a few weeks, although I could feel it wasn't serious for her (despite we had sex, kissed in public etc., she never realy called us a couple). I never really told her how I feel about her, I guess I was afraid of rejection, and I was kind of happy, I didn't want things to change. However they did, she just started acting as we were just friends again and I couldn't do anything. Now, I'm back when I was a year ago and I feel worse than ever (it started affecting my grades, I can't sleep properly anymore, I can't even enjoy things I used to love like movies). I feel like she was playing with my feelings and I hate her for that (yet I'm still in love with her, is that even possible?). In other surcumstances I would try to move on, broke contact with her, but I see her everyday, we have the same friends, and I can't do it just like that without being awkward about it among my friends (and seeing her everyday isn't exactly helping me in forgetting her). At the same time I know she's not right for me, that she will never feel the same about me how I feel about her. I still have some hope, I'm jealous about her and I'm angry with myself for it. I just want to wipe her out from my mind, and stop thinking about her constantly, but it feels impossible. I'm really exhausted and I have no idea what to do.

Tell her what you really feel and be ready to accept what she'll say.

I'm also considering that you are already obsessed with this girl as it's affecting you negatively. Join clubs or sports to divert your attention instead of thinking of her all the time.