Un palais d'épines et de roses, tome 3 : A Court of Wings and Ruin de Sarah J. Maas
"It's so much harder", she said, groaning as she chucked the rest of the blanket into my lap and rose to her feet. "When enemies turn into friends. And the opposite, I suppose. What didn't I see? What did I overlook or dismiss? It always makes me reassess myself more than them."
"Another joy of war?"
She snorted, heading for the tent flaps. "No - of life."