"I know you will." Though, he doesn't have many secrets left and those that he does, he's not sure even Katniss knows. In a surprising turn of events, if Peeta could make it always be just them, he would. He smiles at that, nodding.

"It's the best secret I've ever had." Which would have formerly gone to the 'I'm in love with the girl on fire', but since this involved actually getting to be with the girl on fire, it trumps that one.