The Doctor noticed her looking, and with the added context of her question it was an easy guess what she was looking for. He gave Jack a short, silent, wide-eyed smile: a 'Can you believe this?' sort of look.

The question was more difficult to answer than Nagmeh likely thought. Lovers, certainly not, but 'friends' seemed somehow a little too general.

"Former traveling companions," the Doctor settled on after a couple of seconds. His fingers curled gently around the stem of his glass as he looked back to the man across the table. "How've you been, Jack?"

His overall demeanour was casual, but there was at least a touch of concern there. At the very least, the amount you'd expect to hear from someone you hadn't seen in a long while.