Only once a week? :-)
"Fighting" is nothing but the clash of values. You have to constantly measure your values (and expectations) against those of other people and of the world. A good spouse helps you do that. You just have to perfect the way to do it without threatening the relationship (i.e., you don't start with "If you feel that way we'd be better off separate.")
If there's one thing I've learned by outliving many friends it is this: If you get your way 100% of the time it will kill you! If you get a spouse who will condone all your opinions and support all your habits (and vices) it will shorten your life by decades!
One of the best things that comes from being married, is to have a sounding board for your reality, and a nag to keep you from killing yourself by indulging your bad habits. Treasure conflict, it will keep you young and fit!