unrequited but eventually requited love plots? either that or they leave for someone else ...

https://www.mangago.me/read-manga/for_your_love/

These are all GLs:

https://www.mangago.me/read-manga/kono_koi_wa_hoshi_ni_wa_negawanai/
https://www.mangago.me/read-manga/sasameki_koto/
https://www.mangago.me/read-manga/unrequited_love_skill/
https://www.mangago.me/read-manga/futsuu_no_koitte_nani/
https://www.mangago.me/read-manga/a_monster_wants_to_eat_me/
https://www.mangago.me/read-manga/haru_and_midori/
https://www.mangago.me/read-manga/aoi_hana/
https://www.mangago.me/read-manga/yuri_na_kataomoi_chan/
https://www.mangago.me/read-manga/omoi_no_kakera/
https://www.mangago.me/read-manga/watashi_sekai_o_kousei_suru_chiri_no_you_na_nani_ka/
https://www.mangago.me/read-manga/kimi_koi_limit/
https://www.mangago.me/read-manga/gunjou/
https://www.mangago.me/read-manga/shinyuu_ni_sukina_hito_ga_dekitarashii/
https://www.mangago.me/read-manga/this_love_that_won_t_reach/ (age gap, MC is in love with her sister-in-law; rushed and ambiguous ending)
https://www.mangago.me/read-manga/the_story_of_a_person_who_grew_a_flower/ (short story; age gap, teacher-student relationship;hanahaki disease)

Hope you enjoy!!
https://www.mangago.me/read-manga/green_apple_paradise/
https://www.mangago.me/read-manga/social_temperature/
https://www.mangago.me/read-manga/anaerobic_love_prisoner_of_the_deep_sea/
https://www.mangago.me/read-manga/for_your_love/
https://www.mangago.me/read-manga/starting_with_a_lie/
https://www.mangago.me/read-manga/hyacinth/
https://www.mangago.me/read-manga/heart_stain/
https://www.mangago.me/read-manga/cosmic_boy/
https://www.mangago.me/read-manga/headache/
https://www.mangago.me/read-manga/introducing_my_manager/
https://www.mangago.me/read-manga/kill_me_if_you_can/
https://www.mangago.me/read-manga/guardian_with_benefits/
https://www.mangago.me/read-manga/serious_joke/
https://www.mangago.me/read-manga/bad_contact/
https://www.mangago.me/read-manga/faded_first_love/
https://www.mangago.me/read-manga/kimi_ni_wa_todokanai/
https://www.mangago.me/read-manga/ao_no_flag/
https://www.mangago.me/read-manga/liquor_cigarette/
https://www.mangago.me/read-manga/dear_signal/
https://www.mangago.me/read-manga/tomodachi_engagement/
https://www.mangago.me/read-manga/sensei_wa_butchozura_shite_yatte_kuru/
https://www.mangago.me/read-manga/my_darling_liar_boy/
https://www.mangago.me/read-manga/kimi_wa_natsu_no_naka/
https://www.mangago.me/read-manga/naked_sword_and_tree_peony_of_black/
https://www.mangago.me/read-manga/living_with_him/
https://www.mangago.me/read-manga/renchin/
https://www.mangago.me/read-manga/osananajimi_ja_gaman_dekinai/
https://www.mangago.me/read-manga/furimuite_tsukamaete/
https://www.mangago.me/read-manga/furimuite_tsukamaete/
https://www.mangago.me/read-manga/koi_ni_mo_naranai/
https://www.mangago.me/read-manga/boku_no_omawarisan/
https://www.mangago.me/read-manga/suki_ni_nattara_dame_desu_ka/
https://www.mangago.me/read-manga/between_coincidence_and_inevitability/
https://www.mangago.me/read-manga/on_doorstep/
https://www.mangago.me/read-manga/hatsukoi_note/
https://www.mangago.me/read-manga/konosaki_wa_futarikiride/
https://www.mangago.me/read-manga/takara_no_biidoro/
https://www.mangago.me/read-manga/omae_no_hou_kara_kiss_shitekure_yo/
https://www.mangago.me/read-manga/shinyuu_no_dousei_shite_ni_un_to_iu_made/