Want to know too
As someone who loves this kind of stuff, here are some that fit your desc!!
http://www.mangago.zone/read-manga/sayonara_game_minaduki_yuu/ (not really cold seme but doesn't return his feelings until he realizes what he's missing)
http://www.mangago.zone/read-manga/itonaga_kun_no_koi_no_ito/ (again, not cold *at least not anymore* but ex bully. really heartwarming but also makes you want to cry. totally rec this)
http://www.mangago.zone/read-manga/cosmic_boy/?DPwG (cried so hard reading this oml)
http://www.mangago.zone/read-manga/hang_out_crisis/ (seme hurts uke and realizes his wrongs)
THANK YOUU(▰˘◡˘▰)
can you recommend where the uke chases the cold seme but gets hurt then leaves then the seme suffers ykwim (=・ω・=)