Ex girlfriend gets mad at me for talking to other girls?

My girlfriend just broke up with me the other day over nothing really. She's been thinking about for a few weeks even though we really haven't been fighting she just turned into a super bitch all the sudden so I expected it to happen. We'll we live together and have been for for about 6 months and she said she was gonna let me stay here until I save some money up for a new place. Well since she dumped me I've been talking to other girls because im not gonna wait around for her when she just dumps me for no reason and she gets mad that I'm talking to other girls and says I need to move out now! She broke up with me so why should she be mad about that it's her fault! Anyone have any input on why she's acting like this
Ex girlfriend gets mad at me for talking to other girls?
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