Girls, Why would you act disinterested towards a guy, when you actually like him?

You act like you don't give a damn about him. But you put yourself in situations where the guy could approach you to start talking to them. The reason I ask is my co- worker who is a lady was talking to me normally and we clicked really well. Now she seems to act a bit weird towards me like she is nervous. So acts like she doesn't give a damn about me. But then we still chat
Girls, Why would you act disinterested towards a guy, when you actually like him?
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