What does it mean when a guy calls you "little girl"?

I'm the only female employee in my workplace and ever since someone jokingly called me little girl, another coworker that I have a crush on (and I m a bit positive he might like me back) has been calling me little girl, pretty little girl, etc. When he talks about stuff I shouldn t be hearing he always says that it s nothing for my pretty little girl face to be worried about, and it kind of annoys me.

I was wondering if this was a kind of term of endearment? Or something flirty?
What does it mean when a guy calls you "little girl"?
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