u/Excellent_Bet_9572

A few years ago, i read a dystopian romance about a girl that joins a group of boys in order to survive the world that mostly made of tribes and groups that clash against each other, and i think she joins them for protection and she might have something valuable to offer , i mean yeah she's strong but i think she knows something or someone important. Anyways she butts heads with the leader of the group who she eventually starts hooking up with, but his best friend also flirts with her and it's like a love triangle but it's obv in favor of the leader. Does anyone know what's the book called?