Facts: A (Husband) and B (Wife) have been married for more than 30 years now. For decades, they've been living under one house, but separate rooms and separate floors.Why? They can't stand each other's attitude. There's no third party involved on both sides.
All four children are already adults, the youngest is 22 and the eldest is 33. Each spouse is financially capable to survive on his/her own without the other's support because that has been their internal arrangement (no documents) since then.
Issue: Why do spouses still stay together when they don't trust & love each other anymore? (applying the instant facts)