If a girl changes her mood to positive and cheerful when she’s talking to me what does it mean?

There is a girl that is constant bitchy and low energy but my friend tells me that she puts an act when I’m around and acts in a good mood. He’ll say that right before that she’ll be in a negative mood but she puts a front for me.

If a girl changes her mood to positive and cheerful when she’s talking to me what does it mean?
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