" I need to be whole again. Even if it doesn’t last.”
“It can’t last,” she said, staring at him, because how could it, when they could never keep what they had? “It’ll break our hearts.”
He caught her by the wrist, brought her hand to his bare chest. Splayed her fingers over his heart. It beat against her palm, like a fist punching its way through his sternum. “Break my heart,” he said. “Break it in pieces. I give you permission. "

― Cassandra Clare , Lord of Shadows (The Dark Artifices, #2)