How do I for get him?

I cant get my ex out of my head, we broke up this last March, kinda patheitc hu? we both liked each other A LOT I fewll for him really hard well I know for a fact he wont ever go back to liking me, but I think I stillreally like him, everytime I think of him I cry I know we wont ever get back. But I try and talk to him but it always ends badly or him saying Bye. or I dont wanna talk to you.I cant move on And I dont want to I miss him so much but it hurts so bad, and we never kidssed.And I dont think he wants me in his life. Idk why but I really dot want to move on but I really need to Please help im 13, (i know I dont know love yet but lets say I extremely like this guy so much it is crazy!)