my brother has some problem, he is 30 years old ,married ,previously he doubted his sister in law that she told some thing about him ,then doubted another man he trying to spoil his marriage life, after that he doubted another person,and finaly now his doubt with his wife that she has many illicit relationship with others,we know there is no reality likewise he is guessing many things like this, physically also he is obsessed , (talking are constant no anger voice)also his father had some this type of problem