As our final season draws to a close, the Sugars have been thinking about what it means to say goodbye and let go. In this first episode of our two-part series on moving on, the Sugars and Claire Bidwell Smith answer two letters from people struggling to move past their grief after the death of their loved ones. The first letter comes from a woman who recently discovered that her best childhood friend died by suicide. Now she’s haunted by the fact that she failed to intervene years ago. The second letter comes from a woman who has the sickening feeling that she played a role in her mother's death. Both letter writers wonder how they can get out from under their guilt and carry on with their lives. For more information on today’s episode visit nytimes.com/dearsugars.