Because he couldn't control his jealousy he didn't want anybody to be attracted to him so he blurted out his bad traits and apologized immediately afterwards btw regretted it too you know he was like that in past relationships it's hard for him to chase after somebody or have a lot of passion he just gave up easily after uke said he only admired him... It takes alot of courage to continue to pursue someone who rejected u ╮( ̄▽ ̄)╭
I actually don't really like the seme