https://www.mangago.zone/read-manga/love_letter_sakai_kunie/
https://www.mangago.zone/read-manga/yuuutsu_na_asa/
https://www.mangago.zone/read-manga/haikei_pass_jougi/ (fucked up toxic ass manga. you decide if u wanna read)
https://www.mangago.zone/read-manga/by_my_side/
https://www.mangago.zone/read-manga/cosmic_boy/
https://www.mangago.zone/read-manga/kocchi_muite_ai/ (he ends up with another guy btw not with the one he likes)
https://www.mangago.zone/read-manga/ano_hi_seifuku_de (some stories have unrequited love and its very painful oof)
give me unrequited love angst recommendations! heavy on angst