The feeling that I got when I read the other translation is when he tells him to move out he says it for both of them, because in the beginning WK didnt care whether Minho was miserable or not he even says be miserable with me, but now he can't bear to see him in pain and he has realised that Minho isn't happy with him, that's why he is letting him go, I don't think it was selfish, it was the realisation that no matter how hard he tries Minho isn't happy and his happiness means a lot to him, he isn't a toy but a person he wants to protect