He wanted to tell him, but more often than not he wasn't certain himself.

Well, that was very nice of Jack. It almost made his paralyzing inability to speak seem all right. Almost, of course.

Unsure how to act next, the Doctor decided to do what felt natural. And, right now, his natural reaction was to try, somehow, to show Jack that he cared. That he was more than mere words.

He leaned forward and brushed a kiss to Jack's mouth.