Before looking at ways to cope with jealousy, let's try to understand its causes better. Different therapies have different explanations of jealousy. Of course, this insecurity is unconscious. The Family Systems therapists point out that both partners contribute to the jealousy-producing situation. If one partner has an affair, it reflects a troubled relationship, for which both are responsible.
Sociological treatments emphasize cultural influences.
For instance, all societies tell us we should be jealous but in different circumstances, e.g. certain Eskimo men consider it a compliment if a visiting male wants sex with his wife but a visitor wanting to keep the wife would be highly resented. Thus, jealousy is a learned social reaction, not our innate nature. On the other hand, the sociobiologists, like Darwin, believe jealousy is innate and instinctive for genetic survival. Thus, after an affair, men want sexual details and women want to know how serious the relationship is. Needless to say, the best protection against jealousy is a good relationship, i.e. prevention is better than a cure.