[…] 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.