How we cite our quotes: (Chapter.Paragraph)
Quote #1
The only time I really get to see Gale now is on Sundays, when we meet up in the woods to hunt together. It's still the best day of the week, but it's not like it used to be before, when we could tell each other anything. The Games have spoiled even that. I keep hoping that as time passes we'll regain the ease between us, but part of me knows it's futile. There's no going back. (1.7)
As Katniss says here, the Hunger Games have ruined everything. Sure she survived, but at what cost? She can hardly trust anyone any more, and that includes herself. She's become a murderer. In a way, her old life died in the arena. She's come back out, but she can't return to the way things used to be.
Quote #2
I'm sure plenty of people assumed that we'd [Katniss and Gale] eventually get married even if I never gave it any thought. But that was before the Games. Before my fellow tribute, Peeta Mellark, announced he was madly in love with me. (1.17)
The Games changed everything for Katniss, Gale, and Peeta. It altered the trajectory of their lives utterly. Even though Katniss and Peeta made it through – and they were the only tributes to do so – they almost had to become different people to do so. The old Katniss probably would have married Gale; the new Katniss might not be able to.
Quote #3
I hadn't imagined how warm they [Gale's lips] would feel pressed against my own. Or how those hands, which could set the most intricate of snares, could as easily entrap me. (2.55)
We get at least as much, if not more, of a description of Gale and Katniss' physical intimacy in Catching Fire than we do of Peeta and Katniss'. With Peeta and Katniss we see emotional intimacy: comfort and alliance. Gale is the hot one back home who can't possibly understand what it's like to be in the arena, because he hasn't experienced it. Here he's the hunter from District 12, setting "snares" to "entrap" Katniss instead of his more usual prey.