Can girls suddenly get nervous around a guy they know but have developed a crush on?

Anonymous
there is a girl that seemed comfortable around me and would always come up and flirt with me and I would flirt back. A month went by when we didn’t see each other and after I saw her again she was different around me. She now seems to be very quiet around me and doesn’t initiate conversation anymore
Can girls suddenly get nervous around a guy they know but have developed a crush on?
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