TBH, Jealousy stems from insecurity and fear. It is common but not an empowering feeling at all. More than anything it will hinder one from truly loving the other person because with jealousy usually possessiveness and controlling behaviors can develop. yes it is true that if you are jealous because of a friend or loved won, it's likely that you're very attached to them but it's definitely a feeling that you want to keep at bay as much as possible.