I married twelve years ago and I have no child from my husband. He was suffering from depression in the beginning. We worked together to give an end to his depression, so we read Quran, went to mosques and pilgrimage sites and tried to have recreation which were helpful to some extent but my husband is going to extremes in worship related matters; he has disrupted our lives and marital relationship. He is not paying attention to my emotional and sexual needs. I believe one of the reasons I am not conceiving a child is his extremist beliefs and approaches. There are certain acts which are permissible according to religious authorities and doctors but he considers those things as abominable. He believes that whatever he is doing is correct and flawless and he knows what he is doing. He is ready to divorce me and he has already paid my Mahr (dowry). In fact, we separated from each other once but then we reunited on his request. He says that he is willing to engage in studying the Quran. At present, I am feeling lonely and I am psychologically under great pressure because of the fact that my emotional and physical needs are not saturated. I feel like I am losing my faith. What should I do? My husband is receiving attention from others apparently because they are under the impression that he is a practicing and faithful man. This gives him further confidence about himself. I am also from a religious family and I have full faith in religious matters. I study a lot but there is a great difference between my understanding of the religion and that of his. Whenever I want to seek the advice of people whom he accepts, he starts threatening me. Is it a sin, if I separate from him? I do Taqlid of (follow) grand Ayatollah Sistani.