Actually, I feel a little sorry for her. She's very young, in a society (Hollywood) that preaches "if it feels good, do it!". Self-denial in the interest of long-term happiness is not a virtue taught there. So, she's learning for the first time that actions have consequences.
I'm even sorrier for Pattison, and his career. It's unfortunate, but I think he'll be tarred as "the man who couldn't keep Kristen Stewart satisfied," and that will hurt his leading man credibility.