He had an ablation for AFIB in May 2020 and subsequent tests showed cancer in one kidney, prostate and bladder which were all removed.
After 5-1/2 rounds of chemo, he says that ruined his memory. However, his mother had dementia and at least one of his sisters are showing signs.
Here is a link to an article about coping with ISB:
https://dailycaring.com/9-ways-to-handle-alzheimers-and-sexually-inappropriate-behavior/
Wishing you the best of luck with all you have on your plate.
Get support for yourself as well with perhaps supportive affirmation visits from your faith leader of choice, your own PCP, or a community chaplain or other social services professional.
Please contact hospice if you haven't already.
Please start making your plans for a new and safer life for you. Perhaps meeting with the Geriatric Psychiatrist will give you some insights into the sacrifices that you've made.