Why is she acting shy with me?

She is treating me differently in comparison to other guys. As in been very quiet with me and sometimes acting I'm not there. Next thing she will come and stand near me but say nothing. So I wouldn't say she is avoiding me. But I see her laughing and joking with other guys but quiet with me. I like her and I've only been nice to her so I know I haven't done or said anything to upset her

Why is she acting shy with me?
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