Why is marital stability important in a marriage?

A marriage unfortunately is held to a socially higher standard than your relationship with your best friend of the same sex. Assuming we are talking about a man and woman in America, then a marriage is a sacred contract with socially accepted values applied. In America your Best Friend can't sue you for on going support when your relationships fizzles out. But if you are married you can ask for such a payment.

So just based off that it very important for a male to have stability in the marriage base doff of finances alone. A woman also sees the same value. They may not work and financially depend on their husband and they will endure bad treatment by their spouse to ensure they are taken care of and if children are involved they may look past the negative for the good of their children.

But when you remove the legality and social context attached to what marriage should be. All you have is a 2 people that are involved emotionally or financially and nothing is different between that and your relationship with your friends at work or at school.

So stability just really means things are harmonic or good.