Quote 22
Peeta says it will be okay. We have each other. And the book. We can make them understand in a way that will make them braver. But one day I'll have to explain about my nightmares. Why they came. Why they won't ever really go away. (Epilogue.6)
Even twenty or so years after the Games and the war, it takes courage to get through each day. The events Katniss and Peeta witnessed – and the things they had to do in order to survive – have left permanent marks on them, mind, body, and soul. They can try to "make [their children] braver," but that's something they have to do for themselves all the time too.
Quote 23
[…] the Capitol has not killed or even punished him [Peeta]. For right now, that exceeds my wildest hopes. I drink in his wholeness, the soundness of his body and mind. It runs through me like the morphling they give me in the hospital, dulling the pain of the last weeks. (2.26)
It's also hard to tell if Katniss and Peeta are just friends, or if they're in love. Here, it sounds more like Katniss loves Peeta. She compares the discovery of him being alive to receiving a drug like morphine. Finding out he's somewhat "whole" is the best news she could receive in this moment, and, it sounds like, more than she ever expected.
Quote 24
"You're alive," I whisper, pressing my palms against my cheeks, feeling the smile that's so wide it must look like a grimace. Peeta's alive. And a traitor. But at the moment, I don't care. Not what he says, or who he says it for, only that he is still capable of speech. (2.65)
This seems like proof that Katniss loves Peeta, even if she can't admit it to even herself. The mere knowledge that Peeta's alive is all Katniss wants to know. It makes her grin like an idiot and she doesn't even care about the details, like about why he is alive. All that matters is that he is.