The subjective nature of love and happiness makes it difficult to examine them objectively. Outlining the purpose of human life as the search for happiness and the avoidance of suffering, Freud began a systematic study of the psychology of love. His most enduring contribution in this regard was the discovery of the link between adult and infantile love. Oedipal love gives us a feeling of certainty about what true love is. Mutuality and positive reciprocity are the secret of happy love. Love is a strong motivational drive in life, a force for psychosocial development, and a central interest of humanity. Love is an attempt to simultaneously find something new and refind something old. The author examines which psychological factors lead to a happy result and which lead to failure.