It's actually a common method used in psychology to deal with things requiring people to act, or exist, in your life like they never will. It gives you closure

It's actually a common method used in psychology to deal with things requiring people to act, or exist, in your life like they never will. It gives you closure to read that letter everyday, even (especially) without ever sending it and receiving a reply. Your mind automatically does it, so goes the theory at least.