"The Last Letter" is a song written by Rex Griffin and popularized by Waylon Jennings. The song tells the story of a narrator who is expressing their feelings of being treated as just a friend by someone they deeply love. They question what they have done to become distant and cold in the eyes of this person. The narrator wonders if this person will ever truly be happy again, and whether they will regret their actions when they grow old and withered. The narrator acknowledges that they cannot offer material riches like diamonds or mansions, nor fulfill material desires like fancy clothes. Yet they implore the person to consider the emotional distress and heartache they would save by choosing love over material pleasures. The song also hints at the possibility that the person may be involved with someone else who has wealth, symbolized by "another man's gold." The narrator states that if the person ever feels weary and lonely, they should remember the heartfelt letter that has been written for them. However, they also request the person not to respond if they do not truly love them, as it would only prolong their suffering. Overall, "The Last Letter" explores themes of unrequited love, longing, and the value of emotional connection over material wealth.