My newly married sister unnecessarily doubt on her husband about past relationships before marriage. We know there is nothing she doubt unnecessary. She is very frustrated, depressed from life. She fight daily with his husband. She has made life if everyone difficult. Obviously because of all these the guy is also frustrated now. Now she think that he doesn't love him. Situation is very complicated. Now she doesn't believe anyone mom, dad and me. We obviously love her and we are very worried about her. Can we seek medical help in this? Is there medicine for these kind of condition? These things happens because of some kind of deficiencies? Immediate response is appreciated.