Why was Camilla so cruel to Diane?
So the movie never really explains why. But why does Camilla go out of her way to hurt Diane? She goes from saying, "You drive me wild," to "We shouldn't do this anymore," in the same moment while Diane wants to make love. Then during the car scene with Adam, Camilla asks for Diane to stay so she can see her making out with Adam. She then looks at Diane to make sure she saw; indicating she wanted to rub it in Diane's face that she has a different lover now. Then finally we have Camilla inviting Diane out to the party near Mulholland Drive. She brings her up a way where she wouldn't be seen by other guests of the party and then she's seated in a corner away from Camilla who is fondling and kissing Adam in front of her. Then the ultimate hurtful action she put Diane through was where Camilla is kissing another girl, obviously having an affair with a woman but not her and Diane breaks into tears and then leaves once it's announced Adam and Camilla are being married. Ultimately, Diane is so torn and shattered, she hires a hitman and wants Camilla dead, "More than anything in this world."
What was Camilla's intention with hurting Diane? What was her motivation in hurting Diane and rubbing it in her face that she has other lovers? Why was Camilla so cruel to Diane?