Extreme physical abuse is another basis for separation. Suppose an unbelieving mate often gets drunk, becomes enraged, and causes the believer physical harm. (Proverbs 23:29-35) Through prayer and by displaying the fruitage of Jehovah’s spirit, the believer may be able to prevent such outbursts and make the situation endurable. But if the point is reached where the health and life of the abused mate actually are in jeopardy, separation would be allowable Scripturally. Again, congregation elders should look into charges of physical abuse when two Christians are involved in the troubled marriage, and disfellowshipping action may have to be taken (not report to police!)
Yet, what if a very unhealthy spiritual state exists where both mates are believers? The elders should render assistance, but especially should the baptized husband work diligently to remedy the situation. Of course, if a baptized marriage partner acts like an apostate and tries to prevent his mate from serving Jehovah, the elders should handle matters according to the Scriptures. If disfellowshipping takes place in a case involving absolute endangerment of spirituality, willful nonsupport, or extreme physical abuse, the faithful Christian who seeks a legal separation would not be going against Paul’s counsel about taking a believer to court. W88 11/1 p. 22
Article about a 2012 article by the Watchtower Society by a non-jw and how it reflects wrong advice for wives to stay with abusive husbands. https://www.womensviewsonnews.org/2013/04/dangerous-message-about-domestic-violence/