JEALOUSY IS DEFINED IN TWO MAIN WAYS:
Rival jealousy: this is a fear of possible rivals, especially if you are in a relationship and fear that your partner might be attracted to someone else, may be disloyal to you and as a result leave you.
Envy jealousy: this is being jealous of someone else, such as their qualities, possessions, resources and so on.
The feelings experienced when in a state of jealousy include resentment, hurt, anger, a sense of inadequacy, failure or humiliation and a sense of powerlessness and frustration. Both types might also involve a tendency to compare yourself to someone else, feeling inferior or lacking something and ultimately holding your perceptions of inferiority with a high importance.
The defining characteristics of rival jealousy involve the fear of losing someone important. There is a degree of insecurity in the relationship, regardless if there are many other positive aspects to the relationship. In fact, individuals reporting this type of jealousy claim that they are in the best relationship they have ever been in and it is because of this that the individuals fear losing something this important to them.
A certain degree of jealousy can be a positive thing. It shows that humans have feelings and are not completely robotic. However, partially due to the stigma surrounding jealousy, it can create feelings of shame and guilt.