In this article Freud divides jealousy to three layers or stages, which are competitive or normal, projected and delusional. He describes the roots of normal jealousy in the unconscious and bisexuality. He explains how projected jealousy plays a part at social flirtation, which he saw as a safeguard against actual infidelity. He examines paranoia, after having tackled delusional jealousy and discusses two paranoia cases, which consisted in jealousy attacks. He observes that the persons who suffered from jealousy attacks were focused on their wife's unconscious unfaithfulness instead of their own. One of the patients had homosexual dreams. The other suffered from persecution but at the same time he did not believe them. After having analysed their dreams, Freud concludes they could be neurotic or delusional. Freud also proposed a new mechanism in the homosexual object-choice.