Going into a home is not synonymous with life being unbearable.
Two of my relations had dementia but were perfectly happy while having it and perfectly happy in the care home. Obviously they were unsettled when we moved them there. but had a room with large french windows onto a hedgerow and they had bird feeders outside it, which they kept replenished. My uncle died after 18 montha, but my aunt was there for 6 years, for all but the last six months she was on no medication at all, but at the end was in a state of constant mild distress.
My other uncle was sound in mind and body, but suffered from depression and was prone to self neglect. He was in a care home for the last six years of his life. He described them as the happiest years of his life. He was on anti depressants that worked well and had no worries, no anxieties, he turned all his affairs over to me to manage and did not want me to discuss anything about them with him. As long as his fees were paid that was all he cared. I did keep accounts and handed them over to the solicitor, together with his bank statements when he died.