Agreed. We have a similar situation in our church now with our minister of music. No affair, just a growing apart. She walked out on him and moved to another state. The kids, one just out of college the other a college junior, stayed with dad.
Several years ago we had almost the same thing happen to friends of ours. We attended an interdenominational church affiliated with the Mennonites (but we're not Mennonite). A (married) couple was studying and working together to be ministers. She decided she was a lesbian, walked out on him and filed for divorce. When he started dating another friend (also Mennonite), it was a major scandal in their church community. There was no hope that the first marriage could be saved, but they couldn't accept his getting married again. When they eventually did get married, her parents did not attend the wedding. They came around later as the grandkids came on the scene.
What an interesting case. It is the spiritual equivalent of a bar exam question.
We know that the one Biblical basis for divorce is adultery and absent that, remarraige is forbidden. Now, the question of the hour, can the wife's descent into lesbianism be considered within the scope of 'adultery'? In other words does the adulterous relationship require a heterosexual pairing or just a sexual partner not her husband?