The authors present a theoretical-clinical contribution about jealousy of the young between normality and pathology. They identify a third borderline area characterized by the shared right to control each other, in the couple's relationship. The control of the partner becomes forced and intrusive until reaching a psychopathological risk. Cyberspace gives the opportunity to express such risk. The potentials of new technologies collude with excessive jealousy, amplifying fantasies and making them fictitiously real by the disembodiment of cyberspace.