Most guys act jealous when there is absolutely NO reason to… which makes them look extremely silly and foolish.
Some guys even think that women are impressed by jealousy, likes it’s manly or something… nope. No *healthy* woman would want to be with a guy that feels threatened by other men. Women like men that are confident with themselves and at ease around “the competition.”
Look at it this way, if your girlfriend or date requires constant supervision, if you can’t trust her around other guys… then why would you want her? She’s not the kind of high-quality woman your deserve to be with anyway.