What does it mean when a guy says "you're mine tonight"?

Anonymous
A guy friend said this to me when we went clubbing, we were once involved but our friendship eventually became platonic, we're really good friends now.
He broke up with his girlfriend of two month about a week ago. He knows that I would never be interested in being friends with benefits or being his "rebound", so why do you think he'd say something like this to me?
What does it mean when a guy says "you're mine tonight"?
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