Its about student yaoi/bl where the top bullies the bottom (possibly for being gay), but is also doing 'it' with him (buddy ur gay too). Then when graduation came the top thought the two of them would still be together but the bottom left his ass and didn't tell him where he went I read this one so long ago but I can't remember the title!!!! I wana reread it again because I suddenly remembered it!!
It sounds similar to this one, but I don't think it's the one you're looking for, but I'll drop it here anyway: https://www.mangago.me/read-manga/darling/ reply
