Daisy didn't know what had gone down between Leo and Juliet Gallagher but it had to be bad for her to be petty enough to make him the villain in her novel. The woman couldn't have possibly predicted it blowing up like this but it was still a jerk move.
Maybe they had dated and things ended badly. She kind of doubted that though considering how doting Leo was when they didn't even have a label on them.
She didn't want to upset him further by asking but she really did want to know. He must really hate the woman. After they left the theater, she noticed what looked like little bloody puncture marks on his arms. That must have been from him digging his fingernails in earlier when he was crossing his arms so tightly over his chest in a self-protective gesture.