I know of a situation where a couple based their marriage on hate of an ex-spouse.
This may be a common trait among people who get married multiple times, for with each subsequent marriage more baggage gets packed.
Sometimes these same people feed off of anger and hatred. They continually try to stoke the fire with the ex-spouse because the ex is a common scapegoat.
If you are the ex-spouse in a situation such as this, I have some advice for you.
Don’t fight back because that is just what they want. They want you to lower to their level of hate.
That doesn’t mean you invite them into your home, nor does it mean that you need to sacrifice your life in order to please them.
What it means is that you basically go “no contact” with them. If one of your children is living with them they will also have to learn how to block the hate because that child or children will be the recipient of their “crazy.”
People such as this tend have subsequent divorces because they never unpack their bags correctly. Once you go no contact and the children have moved up and out of their home, they realize one thing quickly.
Their marriage was not founded on love and hate for another is no reason to get married.