Responses
Sometimes when people feel guilty and bad over something, they try to hurt themselves through self-sabotage. He felt hurt over Mamoru's rejection, but he also felt guilty cuz Mamoru's mom wanted him to be married to a girl. So he distanced himself to keep from being hurt, but also participated in self-destructive behaviors to punish himself for thinking that way of Mamoru in general. That's the feeling I get anyway.
Seriously, Kana gave me a headache but I can't really blame him for trying to distance himself from Mamo... What doesn't click with me is him trying to self-destruct (〜￣△￣)〜