He said to his wife: If you do this thing you will be divorced
Question

                I said to my wife that if she did something, she would be divorced, but she did not do it. Did I overstep the line, and is she still my wife? I hope that you can advise me.
Praise be to Allah.
      If a man says to his wife, “If you do such and such then 
      you are divorced,” then this is a divorce that is dependent upon the 
      condition, and if she does that then divorce takes place according to the 
      majority of scholars. 

    Some scholars are of the view that it depends. If the husband 
    intended that divorce should indeed take place if the condition was 
    fulfilled, then divorce counts as such. But if his intention was to stop her 
    doing that thing, and he did not intend divorce, then this comes under the 
    same rulings as an oath (yameen), so he has to offer expiation if it is 
    broken, and it does not count as divorce. This is the view favoured by 
    Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) and some of the 
    scholars. 

    Thus it is clear that if your wife did not do that thing, 
    then nothing has happened, and there is no divorce or expiation. But if she 
    does do it, then the difference of opinion mentioned above comes into play. 

    See also the answer the questions no.
    82400 and
    105438. 

    It is essential to adhere to the limits set by Allah and 
    beware of using the word of divorce in arguments or at times of anger. 
    Divorce is only prescribed to end the relationship between the spouses, and 
    the husband should not use it except with wisdom and caution to end the 
    relationship. 

    And Allah knows best.