There's a version of this letter where the LW is having trouble getting over his feelings and his sadness that they're not returned while still maintaining a relationship with his friend, and he needs advice on how to get some distance from her while trying not to hurt her or disappoint his kids. I would nod sympathetically at that letter. Feelings are hard sometimes!

And then there's the actual letter, where the LW not only doesn't seem to find any value in a twenty-year friendship if his friend's not in love with him, but apparently can't imagine that she might value it either! Saying she "misses" him in quotation marks, Jesus on a unicycle. I feel so sorry for this woman.