Jealousy typically refers to the negative thoughts and feelings of insecurity, fear, and anxiety that occur when a person believes a valued relationship is being threatened by a rival. Jealousy often contains a mixture of emotions such as anger, sadness, disgust.
People do not express jealousy through a single emotion or a single behavior. They instead express jealousy through diverse emotions and behaviors, which makes it difficult to form a scientific definition of jealousy. Scientists still do not have a universally agreed upon definition of jealousy. They instead define jealousy in their own words, as illustrated by the following examples:
"Romantic jealousy is here defined as a complex of thoughts, feelings, and actions which follow threats to self-esteem and/or threats to the existence or quality of the relationship, when those threats are generated by the perception of a real or potential attraction between one's partner and a (perhaps imaginary) rival."
"Jealousy, then, is any aversive reaction that occurs as the result of a partner's extradyadic relationship that is real, imagined, or considered likely to occur."
"Jealousy is defined as a protective reaction to a perceived threat to a valued relationship, arising from a situation in which the partner's involvement with an activity and/or another person is contrary to the jealous person's definition of their relationship."
The experience of jealousy involves:
=Fear of loss
=Suspicion or anger about betrayal
=Low self-esteem and sadness over loss
=Uncertainty and loneliness
=Fear of losing an important person to an attractive other