Once heard a counselor say that when a couple fights, they are revealing their insecurities. Take time to recognize what the fight is about and the underlying concern will be revealed.
He rides her ass about spending? He may be afraid they won't have enough money in their elder years and might lose the house and their independence. She bitches because he comes home late after having a couple beers with the guys? She may feel insecure and fear he will find a new woman and leave her.
It made a lot of sense but now kinda takes the fun out of watching marital fights in movies because you know what comes next.