recommend me any stories that has a couple that were together during earlier years, break ...

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

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

BL
https://www.mangago.me/read-manga/puchitto_hajiketa/
https://www.mangago.me/read-manga/soshite_mata_kiss_wo_shite/

SL some are smut fair warning!
https://www.mangago.me/read-manga/watashi_wa_okazu_senpai_ni_taberaretai/
https://www.mangago.me/read-manga/dekinai_futari/
https://www.mangago.me/read-manga/our_d_days/
https://www.mangago.me/read-manga/gatabutata/
https://www.mangago.me/read-manga/bokura_ga_ita/
https://www.mangago.me/read-manga/kakafukaka/

Hope you enjoy