[He's definitely going to worry about it, but he thinks Ian probably knows that, so he doesn't bother to argue. Instead he just makes a point of once again fixing Ian with that particular 'I know what you're doing' look, this time for several seconds, before giving a sigh.]

Fine. I understand needing something to do.

[But he'll be taking Ian up on that checking in on him thing, and will be very obnoxious about it. And after a few more seconds of silence, he does have to add--]

I know you're probably not interested right now, but if you do want to talk about all of this, you can any time.

[The offer's always open, and that there's an issue in the first place is not in question, so don't even bother denying it.]