I’ve probably made a straw man out of him. He probably has a family and interests.

Trying to empathize will probably make it worse because it will never be reciprocated and that hurts. I bet it would be easier to deal with if you accept that he is your adversary and you don't owe him anything.

I don’t want to go back out into the job market.

At least it will mean you will never have to interact with this particular person again. I think it's ok to hate someone, just channel that into removing their ability to make decisions that affect you.