What happens when you live with someone who is unhappy?
Being unhappy with your life doesn't just effect the person suffering, it effects the people around them too. You'll know if they are internally unfulfilled, they'll try and try to drag you down, they won't just seem sad, they'll be angry, over everything, whether it be small or large issues, the anger will overtake their mind. Thats what ruins a marriage, it happened to mine. When 2 people are unhappy, we broke each other into pieces.