Why do some girls behave this way?

You meet a girl, she shows interest, but once you start to show interest she begins to start trying to making you jealous, sometimes even going to the extreme of using another guy, you begin to get confused & frustrated so you start to ignore the girl, once you do that they begin to either get upset or moody looking like it really bothers them, they linger around you but it’s like there not able to communicate so they just stand there with a lost look on there faces.
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