i second both stories already said. theres also this one, despite it being omegaverse i think its quite realistic in how it portrays emotion and change
https://www.mangago.me/read-manga/exclusive_no_love_zone/
https://www.mangago.me/read-manga/seihantaina_kimi_to_boku/
also “My ID is gangman beauty”

i need realistic love stories.. its so boring seeing the same tropes being recycled