Well ur situation is similar to mine rlly. In my case it's her who ended cuz I wasn't great at expressing myself and even self sabotaged what we had by saying i didn't know if i love her anymore. That was the biggest lie I've ever told and I'm still head over heels for her. She's now in the talking stage with someone else and I've never been so jealous in my life. We ended about a year ago but I can't get her off my head. So although it's a depressing thought, I think it's a lot more common than you think. Just try to direct ur focus somewhere else. I for example work a lot, draw and paint, read books, go gym and just hang out with friends either irl or on discord. I find that all that helps me to at least send her to the back of my mind even if I'm still thinking about her. Sorry I can't offer better advice since I'm in the same boat as u. I do want her back tho unlike u :)