Ego boundary. He only vaguely remembers what that is, and he definitely doesn't really want to talk about it right now. He looks uneasy, and turns himself around so that he can scratch another line in the wall with his foot.

"Are you mad at yourself?" he asks, ignoring most of that stuff. "If you care enough to come here..."

He kind of wishes he could be mad at himself. He wishes he had any idea why he could be mad at himself. It would be easier to play the blame inward instead of outward.