I imagine it would be best to let the MC set the agenda...and then spend a lot of time listening. Be assertive without being aggressive - and make it clear that you want to set boundaries - which, I suppose, is all part of knowing why you are there in the first place...if you're there to try to work on your M...then it will be more about listening than making accusations...since listening might give your H an opportunity to see where his mindset and attitude toward M/R will eventually lead him...it may also prompt the MC to point out some of the reasons people get addicted to their desires.
It's very possible your H will leave the session feeling attacked...I would not shelter him from that feeling.
