He wants to divorce his wife because she might be thinking of someone else
Question

                My problem in brief is that my husband wants to divorce me. He doubts that I am thinking of someone else, and he insists on his doubts. He says that I do not like sleeping with him (intercourse) like I used to like before, and the reason behind this is that I like someone else. What is the solution?

He wants to put an end as he claims in front of my family and divorces me, while he has no evidence to prove his doubts, it is just his thoughts. What shall I do? Allah knows and witnesses that I do not think of anyone but him, I married him because I loved him, as he loved me as well. I do not know what has happened. We have seven children, oldest of them is 14 years old, and youngest is one year and half. What shall I do?.
Praise be to Allah.
    Undoubtedly this behaviour on your husband’s part is wrong; 
    may Allaah guide him. The husband has no right make such an abhorrent 
    accusation against his wife without proof. 

    Sowing the seeds of doubt, persisting in them and trying to 
    investigate them are things that lead to destruction of the family. We ask 
    Allaah to keep us safe and sound. 

    You have to explain to your husband that his thinking is 
    mistaken, and reassure him of your innocence and purity.  If necessary you 
    can swear to him that you are innocent, that you love him and that you want 
    to carry on living with him, for he is your husband and the father of your 
    children. You have lived together for a long time, and it should not come to 
    an end just because of some doubts that the shaytaan puts into a person’s 
    mind.  

    Moreover you know the reason that has made him doubt, which 
    is what he says about you not wanting to be intimate with him. Try to change 
    this idea that he has in his mind. Be loving towards him and draw close to 
    him, and remember that this is something that will raise you in status 
    before Allaah and by which you will attain reward. So do not hesitate to do 
    that and try to find the opportunity to make you husband change his mind, 
    and dispel his doubts by paying attention to him. 

    Turn to Allaah and ask Him to dispel these doubts and set 
    things straight between you, to guide your husband and to bring you 
    happiness in this world and in the Hereafter. 

    If you think there is anyone in his family or yours who can 
    advise him and you think that his intervention will be good, then seek his 
    help in dealing with this matter. 

    We advise you to focus on your worship, for a person may be 
    tested because of his sin, and perhaps you are falling short with regard to 
    the rights of Allaah, may He be exalted. If that is the case, then turn back 
    to Allaah and make up for what you have missed, for if a person sets 
    straight his affairs with Allaah, He will set straight his affairs with 
    other people. 

    One of the salaf said: If I disobey Allaah, I see that in the 
    attitude of my wife and my mount. 

    So pray and remember Allaah (dhikr) a great deal, and read 
    Qur’aan at home, especially Soorat al-Baqarah, for a person may be envied 
    (hasad) for what he has of blessings and stability. 

    We ask Allaah to help and guide you both. 

    And Allaah knows best.