This poem was good because it was happy and honest, but as far as poetic devices go it falls a bit short. I believe this message of caring for your friend is clear, and if there is a deeper message that I am missing then forgive me because I have seen many of these "thank you my friend" letters. However, I do think that whoever this letter is for is a lucky person to have such a good friend. I really liked the "halfway behind you" thing, it just makes more sense.