Finally, she threw her hands up in a gesture of despair. “Fine, Clary,” she said, with
an unusual—for Isabelle—amount of anger in her voice. “Go ahead and do whatever you
want, regardless of who it hurts. You always do anyway, don’t you?”
Ouch. Clary shot Isabelle a reproachful look before turning back to Sebastian, who
stepped silently out of her way. She darted past him and up the stairs, vaguely aware of
voices below her as Isabelle shouted at the unfortunate Sebastian. But that was Isabelle—if there was a boy around and blame that needed to be pinned on someone, Isabelle would pin it on him. […]
She threw the door open. The room seemed to be a sort of library, the walls lined with
books. It was brightly lit, light streaming through a tall picture window. In the middle of the room stood Jace. He wasn’t alone, though—not by a long shot. There was a dark-haired girl with him, a girl Clary had never seen before, and the two of them were locked together in a passionate embrace. […]
City of Glass by Cassandra Clare
Chapter 5: A Problem With Memory
Wow, Clary is a right bitch, isn’t she? Honestly, in this scene, Clary is doing her very best to emotionally manipulate Isabelle. And when Isabelle doesn’t buy it and rightfully tells her about herself. Clary is all, “Poor me, Isabelle is being a meanie to me.” Instead of I don’t know, realizing that maybe she should listen and actually think about someone else’s feelings for once. No, Clary knows everything and she is going to get what she wants no matter what.
And you know what? Isabelle was absolutely right. Clary ignored everything that everyone has told her and the second snippet is just desserts. Her one true love, kissing on some other woman. I’m supposed to feel sorry for her, but I don’t. This is exactly what she gets.