These are all GLs:
https://www.mangago.zone/read-manga/sasameki_koto/
https://www.mangago.zone/read-manga/omoi_no_kakera/
https://www.mangago.zone/read-manga/girl_friends/
https://www.mangago.zone/read-manga/oniisama_e/
https://www.mangago.zone/read-manga/kono_koi_wa_hoshi_ni_wa_negawanai/ (love triangle - a guy and a girl are in love with the same girl, cheating)
https://www.mangago.zone/read-manga/i_wish_her_love_could_come_true/ (love triangle - girl A loves girl B, girl B loves boy, boy loves girl A)
https://www.mangago.zone/read-manga/school_zone_ningiyau/ (almost every possible couple is unrequited love trope;side character is in love with her younger twin sister)
this_love_that_won_t_reach/ (age gap, MC is in love with her sister-in-law; rushed and ambiguous ending)
https://www.mangago.zone/read-manga/haru_and_midori/ (MC was in an unrequited love with the 2nd MC's mother)
Any unrequited love story with an angsty undertone? Something like Meaning of his gaze. Both Yuri and Yaoi are fine for me but let there be no huge size difference.