Rose you most definitely are not a klutz, you are doing a wonderful service to someone who now seems unable to recognise this. Dementia is a dreadful disease but I think your difficult relationship precedes this.

It's not for me to tell you what to do but it's okay to say you've done all you can. It's not quitting to step back. When you write you have felt suicidal I think ths means you are at the end of your coping capacity - please do not ignore your own warning signs. Put yourself first - it's absolutely okay to do that.