Slinks have you asked him why he is upset with you or even why he feels the way he does?

Has he had a physical? I know he had surgery but if he has a GP, maybe you could call the GP and tell the GP what has been going on and the change in mood and behavior. He may be ill or something or have something going on with his brain or other physical issue that should be addressed. His GP could call him in for a check up an try to see if there are any other issues and keep your concerns in mind.

It also sounds to me as though he feels guilty about something and you are a trigger because you remind him of that guilt. I went through that myself and I was treated poorly and there was a reason. But I don't want to send you into imagining things.
But as I stated a good place to start would be to call his regular doctor, ofcourse without him knowing.

We are here and listening.

Open Eyes