BMB, I wanted to reply to the question of how did we children (my sister and I) manage not to become like my cheating father. I only got stuck reading the thread about the narcissistic spouse - that was educating. And the question of the spouse’s influence on the children was also raised on that thread, several times.
I think partly we (my sister and I) were lucky b/c my father was totally out of the picture some time after the divorce, he no longer visited us and we lost contact with him. My mother who is a very straight Catholic Christian obviously raised us according to her system of values. We went to church every Sunday, we learned to always tell the truth, take school seriously, help at home with the household work, etc. Even while my father was still somewhat in contact with us, it was clear to us children that in our mother’s home we had to behave according to our mother’s rules, and moving back and forth between our mother and father would not be tolerated. We were free to choose to move to our father once and for all if we wanted to, but moving back and forth at will, as a way to escape parental discipline, would not be an option. And I can tell, even an 8 y.o. child is old enough and smart enough to realize, who is the parent who really loves him and provides him with a safe and stable home (even if that comes at the “expense” that you, as a child, have to obey your parent

).
Another thing that, I think, my mother did right, we had frank and age-appropriate discussions about why my parents divorced. Some things were obvious and needed no explanation. I remember a few occasions when my father tried to be physically violent with my mother. Because of this, my sister and I were both afraid of my father and divorce was a great relief for us children. But we also discussed the other things, e.g. that my father stopped bringing home his salary, and later on (I was probably a teenager and could handle discussing aspects of sexuality) our mother also told us that my father stopped marital intimacy with her after she became pregnant with me, and that he had a mistress for 5 years while still living under one roof with us. But certain things about my father’s dealings with other women we knew much earlier, because after my father left us, he started dating the mother of my sister’s classmate and this we knew even as small children. I think, given the choice to discuss the truth with your children or not to discuss it, it is better to discuss it in an age-appropriate fashion. Yes, it will hurt to know that their father did this and that, but at least they will know what happened and why their parents’ marriage fell apart. Children question this and struggle with these questions anyway, so it is better for them to learn the truth. And that will still not exempt them from honoring their father, because the 4th commandment is “Honor your father and mother.” Period, no ifs and buts. It’s not like “Honor them, if they deserve it.”
Now that my father’s wife (from 2nd civil marriage) passed away this January, my sister and BIL kept visiting my father every 2 weeks, to look after him (my sister also took care of the funeral). My sister tells me, recently they had an unpleasant discussion about the past. My father initiated it, because we the children always carefully avoid talking about such things. It would be very unpleasant for us and confrontative towards our father, because we know the truth. So what could we say to our father? Maybe, something like “we know that you cheated on our mother, and we remember how you treated her, and that you chased us out from our home so that we had to take refuge at our aunt for two and a half years, until the divorce was finalized and you were required by law to move out from our mother’s house??” There’s no point having discussions such as these. But, my father started talking about the past while my sister and BIL visited him. My sister tells me that he has no remorse about the past whatsoever, and in his mind, everything that he did to us was fully within his rights and fully appropriate. Almost 40 years after the facts, nothing changed in his mind and he learned nothing from the past.

Now, I became very worried about his eternal salvation and I decided to increase my prayers for him, as well as to bring him a picture of the Divine Mercy as a gift. Jesus promised that whoever will venerate that image, will not perish.