He thought it was rather kind of her not to assume he already was insane, especially considering he couldn't swear to that himself. Especially when faced with questions like this. This was the sort of thing he should be able to answer. It was basically the simplest question you could ask--what have you been doing?

"I... don't know," he said, after a moment. His brow furrowed slightly, as if bracing for the fallout to his admission of failure at basic humanity.