Responses

http://www.mangago.zone/read-manga/itonaga_kun_no_koi_no_ito/
I think it could be this one but I’m not completely sure

http://www.mangago.zone/read-manga/konbini_kun/ idk if it's this but the summary reminds me of it
I regret not making an account sooner when I was used introduced to mangago
But this manga was about this guy was constantly bullied in middle school/Highschool and he was friends with his charismatic classmate, eventually both of them got close to the point were the classmate developed feelings for the guy, only for him to reject these feelings for him and started to avoid him and bully him. The guy was really hurt by this and when he graduated high school he went to a university away his city but to his surprise he meets his old classmate/friend.