This is not all your fault. Things happen for a reason, we may not know what those reasons are, God does.
I'm sorry for your loss. We put my dad in the nursing home Friday. He thinks I was planning it and is angry at me. It wasn't me, but, I did what I thought was right for both my mom and dad. No one can take care of my dad. Someday, I hope he realizes it was for the good of all. Because, I didn't want to see him go there, there just wasn't any choice anymore. I didn't want to see an ending of them being together, sad for me but true...