I'm stuck. I keep thinking about a girl, can't get

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I'm stuck. I keep thinking about a girl, can't get her out of my head. It'd be okay, but it's been like this for years now. I met her 2 years ago, we became very close friends, but I fell for her. She had a boyfriend so I tried not to tell her, I wanted to keep being her friend. But eventually it was too painful and I exploded. One night I told her everything, she tried to keep being friends, but my jealousy was too big and I was causing too many troubles, so eventually she decided to stop being my friend. We talked about it, it was over a year ago. She said I was very good and she was not angry, but the best for us would be to stop talking to each other. It's been a year, yet I still see her. We are classmates and have friends in common, so I still see her all the time, but we don't talk. Today it's her birthday and she is celebrating with our common friends, but I'm not invited since we are not friends anymore. I can't stop thinking about how to be friends again. I know I'm probably still in love and just want to be friends with her because it's better than nothing, but I can't move on. I really need her. It's not the first time I post about her, and I doubt it'll be the last. Maybe I'm obsessed, I don't know what to do.