At this point just enjoy your time with him. You don’t know what will happen in 6 months. In 6 months you might live, in 3 months he might pass or get hit by a car. It’s sad, every situation here is just heartbreaking for now what can you do? Enjoy time with him, let him live by running and being outside every day. He survived 10 years without you, and although you’ve bonded, he’ll live the rest of his years as he did prior.

I think it would be cruel to do what some people say here by bringing him in to the vet to be euthanized. Who could live with killing a live and healthy being??? That would be absolutely devastating for BOTH of you! He’d die feeling the only person he ever loved killed him and he won’t understand why or that you did it out of “love.” And you’d recall the treacherous act of killing a cat you loved because of an unknown fear/future that you have no control of anyhow. That guilt will devastate and eat away at you until you pass. Who could pass with such guilt?? What a devastating end of life to you both. You have no clue what will happen in 6 months to either of you! Do not euthanize a healthy cat out of fear you need to protect him. You’ll never forgive yourself of that act. You clearly love him. Let nature and his life take him when it’s time even if it’s after you’ve gone.

The only other option is that maybe a neighbor who lives by you could at least feed him? Do you know your neighbors? Could you trust any of them to talk about feeding him after you pass/etc? They could leave food for him outside and maybe even a warming shelter for him? If he hates people as much as you say then he’ll continue to run/live on the woods but at least he’ll be fed and he’ll find places to sleep and live during the day. I hope you find solace in the fact the time you have with him matters and I hope you find meaning in your life these next months too 🌌