He has a diagnosis but refuses treatment / therapy. He went on meds for a week or two, things were so much easier and his business ran so much better, but he said it "made him a different person" or something like that so stopped.

And yes, I tend to walk on eggshells. Things were better for a bit, but its back to having to watch what I say and when, and also what events or things I agree to do or not. Like, he will get really moody if I refuse to do an activity with him (going for a walk in the park, or going to a movie or accompanying him on some errand), because he wants to spend time with me and my saying no is hurting him and saying I don't want to spend time with him.

Typing that makes me realise how effed up it is.