Her hate for cheaters doesn't justify her actions towards Dae. I mean are you for real? She's not even part of the problem. It was not her problem period. But the way she's reacting it is as if Dae cheated on her.
She can empathize with someone whom she just met, yet not to the friend she had for a long time? What kind of friend is that? If she's really his friend, she would know him to an extent - for her to think of the reasons or the whys behind Dave's cheating. And it is always, in any scenarios really, best to know both sides of the story before making up conclusions in your head. But no, she made up conclusions base on what she saw and because someone cried.
