I'm confused. Are you living in his house and don't want to live there anymore or do you have your own home that you could sell and move to be nearer to your family? How do yout divide your time at the moment with your partner?
Are you well now or still undergoing treatment? That may influence whether you stay in the same area, under the same healthcare team. Has your partner been been supportive through your treatment?
You are retired but still two years away from state pension age so have some extra income to look forward to. Is your partner still working? If so, have you discussed what you might do when you are both retired?
If you are already feeling lonely in a relationship, making that leap to being single again shouldn't be so very hard. Fourteen years is a long time but if there’s no love, staying just out of habit and a fear of leaving isn’t going to make you happy.
If he’s a decent man, if a bit slovenly, you need to talk to him about how you feel.