If he has doubts about his wife, what should he do?
Question

                If a person has doubts about his wife, what should he do to put an end to these doubts by means of certainty and finding out the truth, and getting rid of anxiety and worry that are caused by that?.
Praise be to Allah.
      The believer should think well of others, assume the best 
      and keep away from doubt and suspicion that have no basis, because Allah 
      says (interpretation of the meaning): “O you who believe! Avoid much 
      suspicion; indeed some suspicions are sins. And spy not” [al-Hujuraat 
      49:12]. 

    This Qur’aanic etiquette is one of the means of peace of 
    mind, happiness and comfort, because suspicion prompts one to search and try 
    to find out, and it may lead to spying, and that is usually accompanied by 
    worry, anxiety and distress. 

    But if there are things that call for doubt and suspicion, 
    the husband has to try to remedy the matter and set things straight, and to 
    block the ways that may lead to fitnah and evil. If the wife -- for example 
    -- gets in touch with people or corresponds with them or is away from the 
    house without any convincing reason and the like, then he may prevent her 
    from doing that. If he is worried about her staying on her own in the house, 
    he can bring her to live near his family or righteous neighbours. 

    We have previously discussed the ruling on setting up 
    recording devices to keep an eye on family conversations. See the answer to 
    question number 13318. 

    And Allah knows best.