IMO, IC should result in changed feelings and thoughts which should, in turn, lead to changed behavior.
Also IMO, you've changed. Compare what you post about now to what you posted about a year ago. Compare how you refused to sue your victimizer a short while ago with how you would have dealt with it a year ago.
Has your H changed? How? I'll ask this, though: if he cheated because he wasn't right in the head, has he healed his head? If he hasn't why does he want to quit IC and/or MC?
I was in IC for 2 years. We're past 2.5 years of MC, with no end in sight (although MC is part of W's IC, so it will end when that does). My W is getting a lot from MC. Strangely, I am, too.
If your H isn't getting what he wants from MC and IC, why isn't he satisfied? Why doesn't he speak up and get what he wants? He gets no points from me for putting up with MC. Rather, if he's not getting benefit from IC & MC, I wonder if he's not willing to face himself and what he's done and to change.
(Note: I'm responding to your reports of your H's behavior, so I really don't know much about him, and my judgments could be way, way off.)