[If this had been six months ago, before blue bands and Ianto and monogamy, he could well have been fighting for them both. The idea that he has to choose one or the other is still a relatively new one - or at least a new one for him to have accepted - and he can't help slipping now and then.
He takes a breath and gives her a rueful smile, finally and rather deliberately letting her hand drop.]
Well, let's hope that's how it goes! I... should probably go. I'll see you around, okay?
[He's not being very convincing, he knows, but somehow, conman or no conman, he's unable to pretend entirely that he's okay with this, even for her sake. He hopes he's also being firm enough that she won't make a big thing about it.]