Hate is bad, but a little bit of righteous anger will get you through this traumatic time. It did in my case. My opinion of course. Just don't let anger fester too long. You have nothing to feel guilty about, by the way, or ashamed. Just because you live in an affluent area, does not mean these things don't happen to your neighbors. I bet more because there is extra cash to spend on these kinds of things.
I agree that you shouldn't worry about him re the wedding. He's a big boy, and can take care of himself ---- he has been doing so anyway for the past 3 years, or maybe more. Continue doing whatever you have planned, but separate from your H.
I agree with CC's email. Best to keep things short and simple and businesslike. As if you are ending a contract, which I guess a marriage is in a way. His walking away is his choice ---- you are just trying to make the best of it, while still caring about trying to help him in his addiction (although, I bet he won't appreciate that, but that's what addicts are like).
Take care of yourself.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim