Girls, If this girl has a boyfriend, then why is always trying to initiate conversation with me and trying to keep the conversation going?

I don't really know her but she is acting overly happy to see me. I can feel something is going on cause we are randomly just getting closer and it feels really good. I can tell we both enjoy talking to each other.

Girls, If this girl has a boyfriend, then why is always trying to initiate conversation with me and trying to keep the conversation going?
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