Nonsense, the British Press would report this, why wouldn't they. If they're not reporting it, it's because it's not true.
I don't think it will be a long and happy marriage because they are both damaged people but for now they are still together that's obvious. It's not that long since the walk about and they were clearly still together then. They ring fenced their assets because if one is sued then the other's assets are safe.
My mother is like MM, always the victim, never wrong, she can hurt you but you can't ask her to stop, zero capacity for self-reflection. My father is a weak man who enables her and enjoys being her rescuer in situations she has made up. It is uncanny. My Dad lost his mum at 7. They have been together 55 years.