It was pretty obvious. The Doctor stared open-mouthed, and didn't follow him. Because the Master never cried. Welled up in frustration or anger, sure, but full on crying? No.
And somehow, the Master had apparently manged to completely miss the fucking point.
He ran his hands through his hair. "I meant. There's no way I can you how things will turn between you to. I'm sorry, I can't. I was saying you knowing you didn't want to hurt me. That's. Real. And something. And I think, important. That you know anything you want, right now. That's good."