Women raise their children and expect and require resources from their mates. In summary high male investment explains the relatively weak sexual dimorphism in humans, while the necessity of paternity confidence has led to human males having sexual jealousy marked by violence and consistent attempts to restrict the sexual behavior of women. Female jealousy is centered more on concerns related to paternal investment than on male extrarelationship sexuality per se, as greater paternal investment should increase the chance of survival for the female's offspring. In short, sociobiological theory holds that female jealousy is marked by fear and anxiety over losing the relationship and by an interest in the nature of the rival relationship, whereas male jealousy, focusing on the sexual threat of the rival, is marked by competitiveness and aggression, and is much less affected by situational factors suggesting that the mate is still interested in maintaining the primary bond. It is not just Christianity, in which Jealousy plays a role.
Stories abound in mythology of Jealousy and the havoc it wreaks.
Numerous tales of the affairs of Greek Gods and the revenge their mates take upon those unfortunate mortals touched by another of the Pantheon's love. Many a woman was transformed by Hera, for mating with Zeus. A war was fought over Helen of Troy. Sir Tristram of Lionness, died because of a broken heart caused by Iseult who loved him, over another Iseult whom he loved. However, while the above two paragraphs are more than adequate in showing the existence of jealousy in many different cultures it is not the only evidence.