[He doesn't say anything for a moment, choosing to sip his drink for a moment instead.

He can't deny it, so he doesn't. So, for the first time in their entire time knowing each other, he is honest of his own free will.]

You made it clear that we aren't friends, Arthur. And you told me something very - very personal to you. I thought it better to let you make the first move. So. Here we are.