Girl has a boyfriend but flirts with me. Why do people do that?

Anonymous

I have a crush on her and get nervous, and she picked that up.

She keeps asking me why i get nervous, asks me if i have a crush on someone, and also asks me if i have a girlfriend (i dont).

one day we were talking while standing and she got really close to me and started to touch my tummy, keeping her hand placed there and just looked at me without saying anything.

I asked a few friends of mine about her and they told me that she has a boyfriend but it’s “not serious”. i assume by that they mean they do casual sexual stuff, I don't know.

why do people do this?

Girl has a boyfriend but flirts with me. Why do people do that?
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