Oh, a big one I missed:

Honesty. When I say honesty, that comes with revealing things at the given time of distress, not six or twelve months later. Honesty is important, because what can no longer be resolved are issues that have been underpinning for twelve months before the other knows about them, and can deal with them. I think holding things from one another is the same a lieing to one another basically, because your not being honest and truthful. It often makes a person feel much better having all things out there, not held within.