I'm glad you're reading this blog post because it means these things are not going unsaid. I recently stumbled upon a web site called "The Things Unsaid Project." It's a new development self-described as "a daring new social art project that allows individuals the opportunity to voice their long-silent words and remind us all of our shared connections, emotions, and experiences."
I have to admit - my hope for you is that you have the strength and the know-how to tell the hypothetical person how you are feeling now, rather than waiting for it to become the "unsaid."
I also wish I had the power to bring people back so these letters wouldn't have to be unsaid. So many wishes and hopes. But know this: you're never alone.