What is possessive body language?

the guy I am dating said when my friend was around us I was acting "possessive" with my body language.

what does this even mean?

he was teasing me about it, and loves to talk about how I want him, how into him I am, etc.

yet he always wants to hold my hand and kiss me all the time

is he just "reminding" me how I want him all the time because he likes me?
What is possessive body language?
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