After caring for two parents lovingly in their own home for a decade I would not recommend it. Caring has to be the most difficult job that you can undertake and unless and even if your heart is in it - at times next to impossible. It puts great strain on marriages.
I would suggest that you look at care for him in his own home coming in a couple of times a day. This will cost money but might save your marriage. He will be happier living an independent life and may have friends who he will not lose touch with. If necessary he can have day care respite. It does still need everyone to work quite hard at say a weekend rota of seeing him regularly, having him to stay for Christmas and so forth. I would keep this going as long as possible.
Do not feel guilty about it . Have an honest conversation with your partner.