Chamaeleon by Autumn Reed, Julia Clarke

Haley
“For the last seven months, my life practically revolved around ‘my’ guys—they kept me safe, made me laugh, and embraced me as one of their own. And, now, the unimaginable was happening. I was turning my back on the life I created with them. There would be no more duets with Chase, tickle fights with Theo, stargazing with Ethan, running with Knox, relaxing with Jackson, or cooking with Liam. In other words, I was walking away from the place—and the people—that had become my new home.”

Knox
“Theo opened his mouth like he was going to say something but then shut it again. The truth was, there was nothing left to say. We had to either compete for her heart or let her go, and both options were incomprehensible. Even if she chose me, could I live with the guilt of knowing I stole her away from my brother and best friends? And, if she chose someone else, would I ever get over her?”