My parents have been clearly unhappy together for years but refuse to divorce. I see many couples like this. Why do people stay in marriages that make them miserable?
Reasons include: financial dependency, children, fear of being alone, religious beliefs, sunk cost fallacy, fear of social judgment, and genuinely not knowing if the grass is greener.
Many people stay because the pain of staying feels more familiar than the fear of the unknown. Change is terrifying even when the status quo is painful.