I want to clarify something - when I said your H will slip up again, I wasn't referring to his R with the Troll (what goes on with her - now, then, or ever - shouldn't even occupy any of your attention/focus). I meant with you and the way you two interact with each other.
It is nice that he seems to be making a real effort this time, but as pointed out, the deadline has passed, and I am certain he will begin to relax....and that's when the old patterns and behavior come back. Those old habits, ya know? I know you know what I'm talking about. You have even stated yourself about the fears you have of not being able to work through the issues (from both sides) that got you both here to begin with.
MC (not just IC) is your only chance at REAL, LASTING change. You HAVE TO FOLLOW THROUGH. This is something I have learned, the hard way.
Getting over a painful experience is much like crossing monkey bars. You have to let go at some point in order to move forward. ~ Joseph Campbell