[She might have been more dismissive, but it's difficult, because it's not as though she's lost what she feels for him. But right now, without her belief, it's a frightening feeling and the fear brings out harshness as self-preservation.]
Whatever you might have learned about me until now, you don't know the darkness I have brought to others time and time again. Better that I should be alone than betrayed one day when you feel the brunt of it too.