The other problem is what it teaches the children. Their family was just broken apart and their lives turned upside down. When they ask who did such a terrible thing to them, the parents answer:
Why no one, silly! This kind of chaos is normal, and you should be happy about it like mommy and daddy are. Now sleep well!
This doesn’t mean you have to fight in front of the children or draw them (further) into the process. But lying and pretending no one did this terrible thing to them creates its own problems. It also teaches them in the most up close and personal way possible that neither of their parents believe that solemn vows have any moral force at all.