She called me her boyfriend when someone hit on her? what does it mean?

Anonymous
I was hanging with this girl (who's been off and on with showing interest) and we walked into a Wawa. some old creepy dude started hitting on her, and she said to him "Thats my boyfriend" (referring to me)

I also agreed with her and said "yeah man thats my girlfriend, sorry"

anyway is this generally a good sign? her saying first, that im her boyfriend? i never asked her to be exclusive by the way (at least not yet)
she likes you
doesn't always mean she likes you/other (post what)
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She called me her boyfriend when someone hit on her? what does it mean?
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