"Say what you like, but given that not running off and hiding has a tendency to a) hurt a lot, b) get me killed, or c) both at once, I'm kinda liking the option that doesn't do anyone any harm. I know, I know, I'm a terrible person - better lock me up before I do any more damage with my reckless selfishness, right?"

Well, of course, he does know that he's a terrible person, but in this particular case the comment is sarcastic. Of course it's more complicated than that - spending time with Balthazar and Raphael here has proven to him that his leaving has had more consequences for his siblings than he'd realised or intended - but, well, he's stressed. And while he'd probably admit it himself under different circumstances, right now he doesn't much care for what Raphael's accusing him of.