Did you read the prequel?
yes I did.
I think you are totally off. In this manga there was not a hint of seme-bulling. The uke left his house because he had feelings for his younger brother. The seme took him in but they were not lovers. The seme fell in love with him but the uke was in a state of depression and self-loathing. For years he could not function (and by that I mean have a job or a normal relationship). He had occasionally sex with the seme but he was still trapped in his feelings and could not move forward. The seme kept providing for him due to his love, but at some point of course his patient would run out. I am sure that both of them had other sex partners these 10 years, but the uke was stuck with his brother while the seme was stuck with him (in the prequel this is mentioned). When the uke left without his phone the seme didn't have and means to tell him that he would have company so the uke witnessed it. And it was a good thing because it shocked him and start to move forward. They became real lovers. He got over the feeling that everyone hates him. He realized that he had to work and not lay in a couch all day. So he left the feeling of guild behind and realize he should repair his life. Sagara is actually a really admirable seme
I didn't enjoy it a lot. First, I needed some context as to why the uke is so messed up and has nowhere to go. I don't like the main couple, I know the uke was bratty and all but the seme is mean in his own way. I like a bit of bullying from the seme but knowing the person you love is outside in the cold while you tuck your one night stand in bed is a whole new level of messed up There is no way he didn't know, the uke stated it himself and the guy knows he won't go back home so he must've known he would sleep in the cold outside. Making someone give up their one-sided love and fall for you is different from being mean to them and reminding them you are the house owner and using their weakness. Overall I disliked some parts of the uke but I totally hated the seme