He did a marriage contract with her and she changed – should he divorce her?
Question

                I married a relative of mine six months ago. I work in another country; thus we had our engagement and even marriage contract done while I am abroad. Since we married my wife became very different. She keeps saying that she is not happy with me, and that she does not expect any happiness with me in the future. That is why she is asking for divorce. Shall I divorce her? She became very stubborn with me in essential matters such as the full shar’ee Hejab, and working in mixed places, while I do love to adhere to my religion.
Praise be to Allah.
    The basic principle concerning divorce is that it is makrooh, 
    because it results in severing of in-law ties and the breaking up of the 
    family, and hardship for the children. 

    Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) 
    said: 

    The basic principle concerning divorce is that it is not 
    allowed, rather it is only permitted as much as is necessary. 

    Majmoo’ al-Fataawa (33/81). 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said: 

    The basic principle concerning divorce is that it is makrooh, 
    and the evidence for that is the verse about those who “take an oath 
    (eela’) not to have sexual relation with their wives” [al-Baqarah 
    2:226], i.e., they swear not to have intercourse with them for four months. 
    “then if they return (change their idea in this period), verily, Allaah 
    is Oft-Forgiving, Most Merciful. And if they decide upon divorce, then 
    Allaah is All-Hearer, All-Knower”. This implies a kind of threat, but if 
    they return, i.e., go back to their wives, He says: “verily, Allaah is 
    Oft-Forgiving, Most Merciful.” This indicates that divorce is not liked 
    by Allaah, and that the basic principle concerning it is that it is makrooh, 
    and that is indeed the case. 

    Al-Sharh al-Mumti’ (10/428) 

    But because people’s nature, character and religious 
    commitment vary from one person to another, it is essential that divorce be 
    included in the laws prescribed by Allaah. A woman may be harmed by staying 
    with her husband if he is lacking in religious commitment or he has a bad 
    attitude or harsh nature, and a man may be harmed by staying with his wife 
    if she is not fit to raise his children or she does not give him his rights 
    on a reasonable basis. Hence prescribing divorce is wise and is suited to 
    human nature. 

    Both spouses may be better off after divorce, as Allaah says 
    (interpretation of the meaning): “But 
    if they separate (by divorce), Allaah will provide abundance for everyone of 
    them from His Bounty. And Allaah is Ever All‑Sufficient for His creatures’ 
    needs, All‑Wise” al-Nisa’ 4:130]. Hence divorce is not the end of 
    the world, and divorce may be the best way for a couple who are incompatible 
    in their natures, behaviours, attitude and actions.  

    Based on this, what we advise you to do is to bring in wise 
    people from your family and hers to intervene and convince her of the 
    necessity of mending her ways and changing the way she deals with you, and 
    to promise to follow the straight path in your married life without any 
    deviation, and tell her that this is the only way you can continue the 
    marriage with her. If she responds and accepts this, then praise be to 
    Allaah, and perhaps Allaah will bring you together.  

    We advise you to wait for a while before completing the 
    marriage, so that you can see how keen she is to settle down to living with 
    you, and how able she in fact is to do that, because what you have told us 
    about her makes us doubt strongly that she is keen to agree to that or is 
    able to do it. 

    If she does not agree, then what we think is that you should 
    divorce her; divorcing her now is better for you and for her than divorcing 
    her after consummating the marriage or having children. 

    If you do that and divorce takes place, there is no sin on 
    you, because divorce in this case is obligatory or mustahabb, especially if 
    she insists on working in a mixed environment, which is something that is 
    haraam and you should not compromise about it, rather you should make her 
    give it up. If she insists, then this is sufficient reason to divorce her, 
    so how about if the other things about her are added to that?! 
And Allaah knows 
    best.