As much as we think we know someone-- especially someone we consider to be like another Self-- we aren't mind-readers. Communication is vital to avoid misunderstands when possible and to minimize them when necessary.
When it comes to dealing with unpleasantness, there's no good time to deal with it. We always lose when we deal with it, but we lose more when we deal with it later (when it's become a more serious matter). So we may as well get the unpleasantness over with.
Money matters are one of the main sources for friendships to end and for marriages to end in divorce. Communication is vital for money matters, too.
I agree.. communication is important in any relationship. And of course, Money matters have every tendency to bring Friction in our relationship. True, a lot of friendship and marriages has ended because of money especially when communication was thrown out of the window.