How do i forget about my ex ?

Idk where to put it but since its mlm i put it here. Hi im 14m and a while ago i had my first bf, we were together for around a year but broke up a few month ago, at first it was terrible but after a few weeks i convinced myself that i forgot him but never really did, i keep thinking about what we did and i actually miss him, all my freind have bf/gf and its not rlly helping (not blamming them ofc im happy for them!!) But i just wanna forget about him or at least just not thinking about him. He wasn't the besg bf yeah but i feel like i still love him a bit. Im waiting to enter highschool and maybe find someone who will help me forget about him idk.