awwww I feel so bad for you, I know how you feel but please dont blame yourself or think about him being alone and beating yourself up with all these thoughts. You did the best you could and sound like you took brilliant care of him. I dont have any other advice but just wanted to say that and I know how you feel, my bunny died out of the blue in January and I was devastated but just think of the good times and the great life you gave him!