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?
ego. they want to know they really are "all that" and worth fighting for. Lots of guys get a sick thrill from having 5 or 6 girls fight over them. Those guys are usually player and/or cheaters. But men like to be cared for and appreciated as much as us women.