Maybe, there was something wrong with the rule in the first place. Set aside time to talk with each other - both business and personal stuff. Recognize that your partner's business is your business, his problems are your problems, and his joys are your joys. Watch what you say to your wife or husband or friends about your partner. Find a good mediator or consultant early in the partnership to mediate any impasse.
Little things are the big things in relationships.
Say thank you to a partner for a job well done even though it is his duty to do it. You must let your partner know where you are at all times. If you are going to be late, call in. If you have a car problem or a family emergency, call and let him know. Forgive, forgive and forgive some more.