Never both be angry at the same time(give and take)
Never yell at each other unless the house is on fire
If one of you has to win an argument. let it be your mate
If you have to criticize , do it lovinlgy
Never bring up mistakes in the past.
Never go to sleep with an argument unsettled
At least once everyday try to say one kind or complimentary word.
When you have done something wrong, be ready to admit it.
It takes two to make a quarrel and the one in wrong is the one who does the most talking.