"You have a dark heart in you, Valentine’s daughter,” he said. “You just won’t admit it. And if you want Jace, you had better accept it. Because he belongs to me now."

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And I don’t see how Sebastian can be all that fond of Jace, either. He was horribly jealous of him all his life. He thought Jace was Valentine’s favorite,” added Clary. “Not to mention,” Magnus noted, “that Jace killed him. That would put anyone off.

— Cassandra Clare