What does it mean when a guy says you're his girl to people when your next to him?

Anonymous
I was standing next to him this girl all of a sudden asks if he is going out with this other girl. Suddenly he says no she's my girl when he is looking at me then smiles. I said yeah and smiled back.

So What does it mean when a guy calls you his girl?
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Also I like him..
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I'm not sure what to do, and any more suggestions would be really helpful.
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What he does now,is not speaking,but flirting,and he stares at me until I leave or he has too .What should I do about that?
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Well This week I saw him with other girls, People I had talked to about this say their only friends, and his sibling is their friends. I don't know what to do anymore or what to think about this.
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I found out he is only friends with the other girls and to everyone he is not a player!
What does it mean when a guy says you're his girl to people when your next to him?
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