For a lot. For the wall between them, for the secrets he was keeping and the secrets he was breaking. For stressing her out, something so obvious even he couldn't get away with ignoring it. It was too much, too complicated and too much of a mountain for him to climb now.
So he shrugged, "Just for making things difficult I guess. Go to sleep. I'm staying until you're awake, I promise." To say that sometimes the guilt caught up to him would be false, because it implied it was ever far away from him in the first place. Sometimes it snuck up on him though, and he tried to make up for.. Everything, where he could.