What does it mean when my boyfriend grabs my butt and says, “That a** is mine”? Is he saying that I'm his girl?

Sofia14
He also made me say that my ass belongs to him and then he asked me whose this dick belong to and I said it belongs to me
What does it mean when my boyfriend grabs my butt and says, “That a** is mine”? Is he saying that I'm his girl?
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