What does it mean when a girl asks if you have a girlfriend?

So, I visited this girl I knew since high School. I also think she had a slight crush on me back then but I digress. Anyway, I go to where she works at around 7pm.

She had her son there as well.

She came from the bar where she was working at ti give me a hug,

We chit chat a bit, then she says "Do you have a girlfriend?" I say no then she tells me she was in a relationship last year with a guy for three years, got engaged, moved in with him for 2 months, then broke up.

So why do girls ask if a guy has a girlfriend?

What does it mean when a girl asks if you have a girlfriend?
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