Jealous people are often perceived as unreasonable, controlling, troubled, possessive, and dangerous. When jealousy enters romantic relationships, it often brings pain, as suspicion and conflict are likely to follow.
It is no surprise that research has often linked romantic jealousy with strife and dissatisfaction in a relationship. Jealousy-prone individuals have been found to suffer from low self-esteem and self-confidence, to experience depression, and have insecure attachment styles.
-Noam Shpancer Ph.D.