Andy decides to write about the good times he spent with Rob and how special their friendship was.
Explanation:
This question is about "Tears of a Tiger" where we met Andy and the fateful day he was involved in a car accident with his friend Rob. The accident ended up killing Rob, but Andy survived and was very depressed by the death of his friend feeling guilty and unworthy.
Andy's parents try to help him in the best possible way and say that it would be a good idea if Andy got in touch with Rob's parents. Andy doesn't think this is a good idea at first, but ends up writing a letter showing the good times that he and Rob lived. Rob's parents receive the letter and are very moved.
