Having to live for years unable to touch anyone or killing them would mentally break anyone. He's one of the few emo protagonists I know that actually has a good reason to be this emo.
Ok...sure... you may have killed a highschool friend... but if he was with that group, wasn't he also looking to kill you or at least allow them to kill you? So nothing's lost really...
Yeah, it's probably going to be Alice's mom that cursed him and Alice will either be immune OR touching her will break the curse. Now, why she would curse him in the first place is still a mystery, because from the way people have talked about her, she didn't seem be to evil.