He is sluggishly realizing they're on the same page. Sort of, anyway. He keeps playing with her hand, and then he says:

"Ten years from now, we will exhaust ourselves on the argument of whether I was wrong to bring it up now."

And they will, at least in his mind, whether they're here or out in the world beyond or in his world or hers. Ezio doesn't really have a plan so much as a vague goal, with the path between comprised of whatever hurdles might show up.

"I truly believed you knew."