What does it mean when a guy call you his girl

Anonymous
I was talking to his guy for about a couple months. We had been having a lot of conversations back and forth all the time over every thing. Were he came from friends to more than friends. He finally call me his girl does that mean in a guy definition that I'm his his girlfriend. I'm asking this cause I have to take it extra slow with him
What does it mean when a guy call you his girl
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