All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
Marital life should be built on good companionship between the spouses. This helps create stability in the family, particularly if the spouses have children. Allaah The Almighty Says (what means): {And due to the wives is similar to what is expected of them, according to what is reasonable.}[Quran 2:228] Therefore, if your husband deals with you in a harsh manner and disregards your feelings as you mentioned above, this is contradictory to the good companionship that Allaah The Almighty ordered the husband to have with his wife. So, we advise you to be patient, supplicate Allaah to rectify him and try to handle the matter with wisdom and without letting the children notice the dispute and disagreement between you two. For further information, see Fataawa 85308 and 86618.
On the other hand, the woman has to obey her husband in what is permissible as long as she is his wife. Thus, if he ordered you to live with him, you would have to obey him. The assumption that your husband has married another woman may be pure illusion. Even if we suppose that he has married another woman, still you have your own rights over him, and he has to treat both of his wives equally. If he mistreated or harmed you, you could file your case to an Islamic judge or whoever acts on his behalf to repel oppression and harm from you.
We would like to draw your attention to two points here:
1- If the spouses separated, the children after the age of seven would be given the choice to be in the custody of their mother or their father, and their expenses will be their father’s responsibility. Sons who reached the age of maturity will be responsible for themselves. If any of them chose to go with his mother, the father will not be permitted to prevent him; if he chose to go with his father, the mother will not be permitted to prevent him. However, the daughters’ custody is not canceled except by marriage or attaining her spinsterhood.
2- If the husband caused his wife harm to force her to ask for a Khul‘, it would not be permissible for him to take the compensation.
Allaah Knows best.