Because love makes people blind. It's one reason he has never really minded that he doesn't get deeply attached to people. He sees the good in everyone; he also sees every bloody-minded, insidious, deceitful part of them. He chooses to focus on the good.

Love, though? Love takes away that choice.

"You trusted them. It was their responsibility to live up to that, and they didn't. It isn't a failing in you, Rosita. It's in them."