@Asuka So I don't know how well I can explain cuz I'm little confused too but from what I understood, the curly haired one was having existential crisis or depression kind of stuff after getting beat up by his brother. And his coping mechanisms is basically BDSM or rough s*x ig. And he wanted The grey haired one to choke him, make him feel inferior (so that he can stop feeling stuff)
The grey haired one did not want to do that. He tried to but in the end he couldn't hurt the curly guy. And I guess grey one left but came back with medicine and stuff for the curly one.
Grey one said he likes curly one but that curly on doesn't like himself and keeps self destructing. And them being together would only be bad for both of them, toxic relationship is never good yknow. So he is kinda breaking up and keeping a distance.