Usually it stems from faulty learning, not extreme insecurities like most pop-psychologists would agree. Most people pick up this trait from one or more of their parents. That is why people can be jealous and still have some form of confidence, some are even proud of that trait because they feel it at least gives them an identity. But it really doesn’t, what it gives them is identity foreclosure because they’re basing their self-concept off their parents and that leads to an inability to form lasting bonds and many friend/intimacy problems in the form of trust issues, and just general “why can’t I keep friends?” It’s psychological immaturity after a certain point and the inability to reach self-actualization comes from an inability to find a true direction in life. Because of this, pessimism usually occurs and usually a lack of social skills and empathy. This of course is linked to many psychological and health disorders. Jealousy isn’t a good thing, it’s like poison for any relationship.
