Gary, I am so sorry to hear about Sam (Shemp)'s passing. You did what was best for him out of sheer love for your friend. You did not want to see him in pain, so you did the right thing. He is in a better place now at the bridge along with all those that have gone before him, and he will be waiting to greet all who will arrive , when it is time. You have so many wonderful photos and many more fond memories, and that is most important.
Take care, and don't be hard on yourself.