Many are the behaviors that disclose that a person can be if exceeding its jealousy, in case, is not so clearly for the proper person. Behaviors such as to examine pockets, wallets, receipts, close accounts, clothes and sheets, to hear phone calls, to open correspondences, to follow the same spouse or to contract particular detectives to make this costumam not to alliviate and still to aggravate feelings of remorse and inferiority of the people who suffer of extreme jealousy. An example of this is case that Wright (1994) described of a patient who arrived to mark the penis of the husband with penxs to confer the presence of this signal in the end of the day. The jealousy is of great interest of psychiatry, over all for the forensic one and also for psychology, from the moment that its manifestation is pathological and destroys the harmony of the relationship (Gillard, cited for Todd, Mackie & Dewhurst, 1971; Towers, Branch & Days, 1999; Rassol, 1996). Despite of great importance to be studied, another complicador factor of this study is the vagueza and the indistino of the limit between the normal jealousy and pathological (the White & Mullen, 1989). In accordance with Kingham authors & Gordon (2004), the pathological jealousy is a set of thoughts and emotions irrationals, together with extreme or unacceptable behaviors, where the dominant subject is the concern with the infidelity of the sexual partner without base in concrete evidences. Bishay, Petersen and Tarrier (1989) and Tarrie et al (1990) had considered that people with pathological jealousy tend to make systematic distortions and errors in its interpretations and perceptions of events and information, then one precipitador event of the possibility to the suspicion inconsistentes and provokes the pathological jealousy. The pathological jealousy can be diagnosised despite the partner considered unfaithful really either or has been (Kingham & Gordon, 2004; Soyka, Naber & Vlcker, 1991).