Adultery is grounds for a scriptural divorce with freedom to remarry. Here is the latest on leaving a mate without scriptural reasons. Same as the 90's when they pulled it out of their a**.
From the book "Keep Yourselves in God's Love" 2008:
*** lv pp. 220-221 The Bible’s View on Divorce and Separation ***
In certain extreme situations, some Christians have decided to separate from or divorce a marriage mate even though that one has not committed fornication. In such a case, the Bible stipulates that the departing one “remain unmarried or else make up again.” (1 Corinthians 7:11) Such a Christian is not free to pursue a third party with a view to remarriage. (Matthew 5:32) Consider here a few exceptional situations that some have viewed as a basis for separation.
Willful nonsupport. A family may become destitute, lacking the basic essentials of life, because the husband fails to provide for them, although being able to do so. The Bible states: “If anyone does not provide for . . . members of his household, he has disowned the faith and is worse than a person without faith.” (1 Timothy 5:8) If such a man refuses to change his ways, the wife would have to decide whether she needs to protect her welfare and that of her children by obtaining a legal separation. Of course, Christian elders should give careful consideration to an accusation that a Christian refuses to support his family. Refusal to care for one’s family may result in disfellowshipping.
Extreme physical abuse. An abusive spouse may act so violently that the abused mate’s health and even life are in danger. If the abusive spouse is a Christian, congregation elders should investigate the charges. Fits of anger and a practice of violent behavior are grounds for disfellowshipping.—Galatians 5:19-21.
Absolute endangerment of spiritual life. A spouse may constantly try to make it impossible for the mate to pursue true worship or may even try to force that mate to break God’s commands in some way. In such a case, the threatened mate would have to decide whether the only way to “obey God as ruler rather than men” is to obtain a legal separation.—Acts 5:29.
In all cases involving such extreme situations as those just discussed, no one should put pressure on the innocent mate either to separate or to stay with the other. While spiritually mature friends and elders may offer support and Bible-based counsel, they cannot know all the details of what goes on between a husband and a wife. Only Jehovah can see that. Of course, a Christian wife would not be honoring God or the marriage arrangement if she exaggerated the seriousness of her domestic problems just to live separately from her husband, or vice versa.
There's the official stand of the Washtowel Birdbath Society.