[He nods, focus landing on the styrofoam cup in his hand. There's a lot that could be said to that kind of statement — even more so when you're well-versed in psychology — but it's really none of his business, and so he doesn't comment.
He also doesn't leave. Once you engage in someone's well-being, you should at least have the decency to stick around for a chat.]
I'm Reid, by the way. I don't think we've met before..?