She's acting this way because you're not sucking up to her to make her feel better. Because of this show of strength, she's doubting whether or not she's made the right decision. Enough to call you and throw an emotional hissy fit in order to see how you react. You are doing the right thing - overall, and for you.
Crying, hatred, - note crying has an innate subconscious emotional trigger. Same with if someone you have affection for declares hatred - emotional trigger. If you show an uncoordinated reaction (being emotional or out of your normal state) - it means to her you have affection for her still, she gets what she wants - she ****s off.
As soon as she gets the validation that 'Oh, I did make the right move - he is lesser than me' - she will be gone. She left you. That was her decision - and she is 100% aware of it.
You keep doing this until she declares that she wants to 'try again' or 'make something work'. Then you say 'I'll think about it'. And end the conversation for that then. Do not agree to anything at that moment, because you do need to think and get your head straight first. From a calm point of view, not the desperate 'Let's fix things' view.
Give it minimum 3 days - more like a week to be best - to decide your response. Leave, or give it another shot. If you do decide another shot, offer up a neutral meeting spot like coffee (this is for public/social awareness, minimize outrages and fits, destruction of your property(have read about this on here)). Talk with her, don't get into heated discussion, just calm talk. If it goes well to you, depending on what you hear - you can lean towards another meeting.
Never ever ever ever - gush about your feelings. I have read too many stories in the NC thread to know that this destroys any sort of chance. Stay detached, stay unemotional. Remove yourself if the situation gets tense. Be cordial always - in your own control.
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Underlying theme though - 95-99% her resolution to quit the relationship is still there, and she's looking for that signal of weakness from you that she made the right call. Not to work something out. You're doing the right thing - continue doing the right thing. There are many stories of guys 'giving in' emotionally here, thinking it will help. But it never does. Trying not to be exaggerated here. But... yeah.
Calm. Unemotional. Reluctant. That's the three main things I'd focus on here.
