[He's just about to apologize, because that wasn't really necessary to point out. He didn't mean to upset her, honestly! But then she adds that bit of hope, and so he smiles instead. A little apologetic, still.]
That's th' best way to look at it, I think. Ain't much more we can do but move on an' make things better, right? Just like enjoyin' th' good days while they last.