“There is nothing weak about Alec,” said Isabelle.
“No,” said Magnus. “To love as you choose, that takes strength. The thing is, I wanted you here for him. There are things I can’t do for him, can’t give him.” For a moment Magnus looked oddly vulnerable himself. “You have known Jace as long as he has. You can give him understanding I can’t. And he loves you.”
“Of course he loves me. I’m his sister.”
“Blood isn’t love,” said Magnus, and his voice was bitter. “Just ask Clary.”