Well, it makes sense to him, even though he's still unaware just how connected she is to Martha, but the more important thing is, she has a connection with the Doctor, one of his other selves, and someone who, from his point of view, has yet to enter the picture.

"Oh, so you're married, are you?" His smile widens at that. He likes it when people are happy, and he certainly hopes that she is. "But I did come for you eventually, right? There's so much to see out there, and it would be a shame if you never got a chance to see it all." He hopes he kept his word, or else she's probably gotten a nasty image of him if he didn't.

Doing as she says, he takes the gauze and the material and holds it there with one hand. It's really so inconvenient, this business of being injured. If he has anything to say about it, he'll try and avoid it in the future, because once is bad enough.