it's the way katniss and peeta are such fundamentally different people when it comes to their driving emotions and the way they view the world, but no matter what, at the end of all things, they are the only two people in the entire god damn world who can understand the specific suffering that they both went through. for katniss there is one person who can share her trauma. for peeta there is one person who knows what it's like. and that's why they will always end up side by side at the end of everything.