Caleb betrayed Tris

Luke betrayed Percy

Teresa betrayed Thomas

Nobody betrayed Katniss!

So she went through the games twice

And a rebellion

. . .

But hey, at least she was spared a betrayal!
Unless you count Peeta's alliance with the Careers, but he did that to help Katniss. And don't think of 'Nobody' as Percy or Annabeth because of Polyphemus (I probably spelled that wrong) Also, Hazel is not included in this one (sorry Hazel) because she's not a Dystopian/Fantasy/whatever character!