Why are (men) so possessive?

so I started dating someone and they told me about how one of their coworkers saw me on tinder and he asked if they matched with me and they said no. we never discussed letting others know we were seeing eachother.
so I jokingly but very seriously at the same time go “after the way I f*cked you I wouldve claimed me too”
and he goes “well.. yeah”
why are men so possessive over women theyre not dating?
Why are (men) so possessive?
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