What does it mean when one of his friends calls you his boyfriend?

I was at a dance the other night. The guy I like is with his close friends. I'm close with his friends and I was talking to his friends. One of his friends pretended to kiss another guy and I was looking at that guy he said "What are you looking at." I shrugged my shoulders and said something. The guy I like was on his phone sending a picture to his friend. The guy said "Your literally blanks girlfriend!" He said and then he repeated it again. The guy I like smiled I also smiled. I shrugged it off. What did his friend mean by that?

What does it mean when one of his friends calls you his boyfriend?
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