How we cite our quotes:
"You're still trying to protect me. Real or not real," he whispers.
"Real," I answer. It seems to require more explanation. "Because that's what you and I do. Protect each other." (21.79-80)
No matter what, Katniss and Peeta are a team. They started out as unlikely allies and yet their relationship has evolved into a complex love/friendship arrangement based on keeping each other alive. Despite all the odds and everything working against them, they can't let go of that.
"I wonder how she'll make up her mind."
"Oh, that I do know." I can just catch Gale's last words through the layer of fur. "Katniss will pick whoever she thinks she can't survive without." (23.89-90)
In the next chapter, we find out that this statement really hurts Katniss's feelings. Outside of that, though, it's hard not to wonder if it's true. Every decision Katniss has made up to this point, not just in Mockingjay but in all the books, has related to survival: her survival and the survival of the people she really cares about.
Trying to shout her name above the roar. I'm almost there, almost to the barricade, when I think she hears me. Because for just a moment, she catches sight of me, her lips form my name. (24.76)
Romantic love isn't the only kind of love in this text, nor is it perhaps the most powerful. The single event that makes Katniss feel most deeply is this glimpse she has of her sister, Prim. Katniss's whole journey started with an attempt to protect her sister. She's been through Games after Games because she volunteered to take her sister's place. That might be the greatest display of love throughout the books.