Her husband is having a relationship with someone else
Question

                After 10 years of marriage and permissible love, and 4 children, my husband has fallen in love with a woman whom he got to know through the Net. She is one of the devils of mankind and has changed our lives. In brief, he has become like a slave to her, she tells him what to do and what not to do, and he has to obey. She has turned my life and my children’s life into hell. He refuses to repent, especially since he is not married to her, because she refuses to get married. I have been divorced and there is one talaaq divorce left. I am living with him but he is always with the other woman even when he is in the house, via the mobile phone and the Net. When I see him talking to her in front of me and not caring about my feelings, I feel as though fire is burning me and I have nowhere to turn except to Allaah, and I complain to Him of my grief.  For two years I have been tasting the bitterness of patience whilst they are living with love and ecstasy as he says and as I see him. Will it ever end and will I suffer this torment forever? I pray to Allaah the Almighty for forgiveness and I pray to Him night and day but I see that nothing happens to her, she is like a mountain that will never collapse. I am caught between my husband’s mistreatment and his love for another right before my eyes. I feel that I am no longer a human being and I think that I have lost all trust in anything. What should I do? Pray to Allaah to save me from this and to make my faith steadfast and to protect me from their evil and their arrogance…. Ameen.
Praise be to Allah.We ask Allaah to grant you relief from your distress and to increase your faith 
    and steadfastness. 
What you have mentioned about your husband’s actions is something reprehensible 
    with which Allaah and His Messenger  (peace and blessings of Allaah be upon him) are not pleased, and of which His righteous slaves do not 
    approve. 
Romantic relationships between men and women are not allowed, and it is clearly 
    haraam, whether that is via the internet or over the phone, or otherwise. If it goes beyond that to meetings and immoral actions, then this is the 
    essence of doom. 
Were it not for this ecstasy that your husband is experiencing, he would feel 
    pain, alienation and confusion, which is what is usually felt by the sinner who persists in his sin. 
Do not believe that he is living a life of pleasure and enjoyment, rather it is 
    intoxication, negligence and a drifting away from Allaah, as Allaah says concerning those who commit immoral actions (interpretation of the 
    meaning): 
“Verily, by your life (O Muhammad), in their wild intoxication, they were 
    wandering blindly”
[al-Hijr 15:72]
One of the most abhorrent of actions is when a person commits his sin openly and 
    boasts about it, not caring about the punishment that awaits him. Hence the Prophet  (peace and blessings of Allaah be upon him) said: “All of 
    my ummah may be forgiven except those who commit sin openly, and part of committing sin openly is when a man does something at night, then in the 
    morning, when Allaah has concealed him, he says, ‘O So and so, I did such and such last night,’ when his Lord had concealed him all night but he 
    discloses that which Allaah had concealed.” Narrated by al-Bukhaari, 6069. 
You should praise Allaah for protecting you and sapring you, and making you better 
    than women of that ilk. The Prophet  (peace and blessings of Allaah be upon him) said: “Whoever sees a person who is afflicted with some trial 
    and says, ‘Al-hamdu Lillaah alladhi ‘aafani mimma abtalaaka bihi wa faddalani ‘ala katheer mimman khalaqa tafdeelan (Praise be to Allaah 
    who has spared me that with which He has tested you and has favoured me over many of those whom He has created),’ that trial will not befall him.” 
    Narrated by al-Tirmidhi (3432) and Ibn Maajah (3892); classed as saheeh by al-Albaani in Saheeh al-Tirmidhi. 
You should note that Allaah gives the evildoer respite until, when He seizes him, 
    He does not let him go, as the Prophet  (peace and blessings of Allaah be upon him) said: “Allaah gives respite to the wrongdoer until, when 
    He seizes him, He does not let him go.” Then he recited (interpretation of the meaning): 
“Such is the Seizure of your Lord when He seizes the (population of) towns 
    while they are doing wrong. Verily, His Seizure is painful (and) severe”
[Hood 11:102]
Narrated by al-Bukhaari, 4409; Muslim, 2583. 
So you should not be deceived by the fact that this woman continues to do wrong 
    and seems to get away scot-free, for there is no barrier between the prayer of the oppressed and Allaah. 
Perhaps you can find some good people who will advise him and remind him of 
    Allaah, even if that is via a Friday khutbah, for example, condemning such haraam relationships and describing the punishments in this world and 
    the Hereafter for those who do such things. 
Make a lot of du’aa’ to Allaah, especially at times when prayers are answered, 
    such as the last third of the night, between the adhaan and iqaamah, between ‘Asr and Maghrib on Friday. There is nothing wrong with your making 
    du’aa’ against her because she is an evildoer, but it is better to pray that Allaah will improve your situation. 
You have to be kind to your husband and make yourself beautiful for him, for 
    perhaps that woman has captured his heart with kind words that he did not hear from you, or by making herself beautiful when you did not. So try 
    to win him over in that way. And you have to be patient, for this is a test from Allaah by means of which your sins will be expiated and you will 
    be raised in status. 
And Allaah knows best.