He nods as way of thanks. There's always an odd feeling after you tell someone something personal, when the release of confession can make you feel less weighed down or horribly empty. In this instance it's a little of both. He hadn't meant to say that much, but being a volatile person works the same way with anger as it does with sadness --it pours itself out of him until it's gone completely or comes to some sort of finish.

He doesn't say anything until they're outside again. "I should start thinking about some more permanent arrangements of my own, soon."