In my experience, and in reading the experiences of others here and IRL, I think MC only works if both parties want the same outcome, and I don't just mean paying lip service to it, but really truly want the same outcome.
MC hurts because you will be peeling away the layers and exposing all your wounds. MC gives you a forum to voice your resentment. Unless you are both open to hearing these things, then your gut reaction will be to defend, to withdraw or to attack. Is he ready to hear what you have to say ? Is he emotionally mature enough to listen to your pain?
More importantly, are you? I imagine you have come a long way since last summer. You are no longer as drawn into his crazy, but can you sit in a room for an hour and listen to him throw everything but the kitchen sink at you?
If he wants to go to MC, then go, but don't do it with any expectation it will be anything other than a soap box for him. Listen, validate. Don't complain and don't explain. (I know, that sounds like a lot)
Otherwise, I would carry on as you are - focused on becoming a better you (with or without him) and trying to maintain a calm, mature demeanor whenever you're with him.
BTW - You are doing brilliantly. Never doubt how far you've come.
