I belong to a church that believes #1.
My wife committed #2 - infidelity and abandonment.
That sort of leaves me out on an island.
I always thought divorce was wrong and never believed I would ever get one. But the reality was that there was absolutely nothing I could have done to prevent my wife from doing what she did. I have just had to learn to accept it.
My wife had suffered from some disturbing mental health issues. To me they had manifested only in the last few years of our marriage. But since she's gone my adult daughters opened up and shared with me the fact that their mother had some disturbing psych episodes while they were young children and I was away at work. In one instance she grabbed a pot of hot chili off the stove and threw it at my daughter. In another she threw a hammer. But she would always click into June Cleaver mode by the time I got home from work, and my kids opted not to tell me anything of this until recently.
You always think that staying together is the best thing for your kids, but now I actually feel guilty about that. There were apparently instances where I was putting young children in danger by leaving them at home alone with her.