Why do guys try to make their girlfriends jealous on purpose?

MiaChan
OK so dis is a mean thing guys do at times which I don't like, there was dis guy once who was always trying to make me feel jealous (never worked btw) by mentioning how hot dis chick or that chick was , even though we weren't dating but he always kinda said that we both should hook up & I always used to brush it off as a joke, but even so guys who are in relationships sometimes even try to make their girlfriends jealous, why?

Why do guys try to make their girlfriends jealous on purpose?
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