Just started reading it so I don't know how it turns out but they are fighting by chapter 1 so I felt weird about not mentioning it its called "The Most Ordinary Relationship" they've been dating for 10 years and the main one having issues in the relationship is the uke because of the cohabitation but the seme doesn't notice it because he's horny and the uke is upset when they have sex but as soon as they're done he gets mad at the seme because he has work the next day so he's sore and tired and even hits the seme at one point because of how upset and tired he is. The fighting gets halted by the story telling you how they got into a relationship if that's a problem.
https://www.mangago.me/read-manga/the_most_ordinary_relationship/
definitely this one, it has a sequel btw https://www.mangago.me/read-manga/kyuuso_ha_cheese_no_yume_omiru/
bonus https://www.mangago.me/read-manga/escape_journey/ i kinda like it

I want to read stories about how difficult it is to maintain a relationship, like the couple is constantly in fights, arguing with each other, always on the edge of breaking up, but then they still tries to be together. I dont care if the story is toxic or something lol
It will be a bonus if they are possessive with each other, cheating elements is alright too because what is life without crumbs of cheating huh