I can understand his wish of not wanting to have contact with her ever again, but unfortunately i'm afraid of 2 things: 1, there's a high chance he'll carry this on the back of his head for the rest of his life if he doesn't settle things right, and 2, that he is overcompensating with this relationship way too much. The girl probably need to work through her issues in a similar way, too, before charging blindly into a relationship like that.
But like i said, his reaction is very plausible and understandable, just not one that'll likely resolve all of his problems in the long run.