
Originally Posted by
chormatus
When we enter into romantic relationships, it comes with the expectation that you would be "exclusively" for each other and no third party. Jealousy arises when the expectation [whether real or biased] of "exclusivity" is threated. This could result to mixed emotions dominated by rage or anger that could possibly lead to physical violence.
There are people who are easily intimated/threated when their sweetheart mingles with other people even with good friends. They usually have low self-esteem - they are threatened that somebody will take away the affection of their beloved. For more information search in google for "Paranoid personality disorder."
Advice: as much as possible, avoid getting into relationship with extremely jealous person - you will live a miserable life with him/her. If you are already in that relationship, be transparent with him/her in what you do and assure him/her constantly that you love and admire him/her as he/she is. Stay away from situations that could threaten his/her self-esteem like going with the opposite *** in small groups.