It is quite obvious that she is upset with you since you mentioned a break up.
When people menace others in anger situations, they indicate their true feeling about what is bothering them. Obviously, you must have given a thought about separating way before having the fight, otherwise you would never even have spoken those words.
Also, you never indicated in your question that you apologized to her and how do you expect her to react if you don't feel sorry for your rude behavior.
One should expect that at your age, civility is a predominating factor as one would not be as impulsive as a teenager anymore. My feeling is that she took your words seriously and is acting accordingly and just preparing herself mentally for this break up of your relation.
An immediate apology is what would have been the correct step to take.
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