Btw if u don't want heavy angst then,
https://www.mangago.me/read-manga/define_the_relationship/
maybe check this one, but I have a feeling u might have read this already
https://www.mangago.me/read-manga/dogusare_dandies/
This one is kinda peak for me, the angst hurt me in the right places and also made me giggle over middle aged men
https://www.mangago.me/read-manga/boku_no_omawarisan/
Unrequited love for like, a chapter or two, it becomes a domestic slice of life after honestly
https://www.mangago.me/read-manga/meguro_to_akino_wa_kizukanai/
Unrequited because they're stupid
https://www.mangago.me/read-manga/kakkou_no_yume/
Og unrequited love...has its fault but it feels like a classic

Unrequited love reco, please. Preferably completed already.