Communicate

Relationships live and die not by the sword, but by the amount of discussion. If two people cant find a way to openly and honestly communicate their needs and feelings to one another, the relationship doesnt stand much of a chance long term. Couples must find a way to communicate regularly, openly, and directly.
This doesnt mean waiting for an argument to tell your significant other how much he bothers you with his throwing his clothes on the floor instead of the hamper. It means telling him when you feel the need to, and to do so in a manner that is respectful but assertive.