His mild incredulity shifts into a slight frown.

"Aye. Well, I've met you." He struggles for a moment to explain more. He has been told that he returned with no memories, but not many people recognized him, or said anything about it. And it would be strange to be told by a man you've never met that you've shared a room, but were not lovers.

So, after a pause, he adds, "I would call you a friend. How long have you -- ?"

Been here, he means.