Below is some of the best advice I've ever read. It's true for pretty much every kind of relationship.
Bill Draper Takes Stock Of A Venture Industry He Helped Create - Venture Capital Dispatch - WSJ: "On relations with entrepreneurs:
“When an entrepreneur has a first board meeting, we called that the ‘Oh sh—meeting.’ That’s when the VC finds out the bad news he didn’t know when he made the investment. How the VC reacts to that defines the relationship – it either becomes more brittle or closer.”"