I know how you feel. Bottom line he treated you like a POS who didn't matter. That speaks volumes about the man. Sorry but I also am not a fan of this type of behavior, no matter what the age or infirmity. I doubt he was in poor health when he got the shaft wood.
My dad lived to be 90 and was in failing health his last few years, but he never took advantage of anyone and ALWAYS managed to keep his word. He maintained his integrity until the very end. I think it's a personal choice.
Even very ill people can find a way to communicate if they want to, even a simple thing like a phone call. "Hello, I'm sick, I won't be able to follow through on what I promised. What would you like me to do?"