God does already know, but sometimes being open to others of our struggles, addictions and problems might help us overcome them if somebody else was in that position and can give us advise. I have respect for people who do deside to share some of their struggles openly and are seeking a change in their life. It's an encouragement to me. Let's be honest, someone who's open about a problem in their life is probably more likely to make a real change than somebody who just keeps it to themselves.