How about telling him "That's great news, I don't want "it" to be like "it" was before too. So as part of the deal, we commit to going to MC. This will keep us focussed on doing "it" differently."
Seriously, you are right. You don't want the same problems and neither does he. OK, so time to take action. MC has gotten us to piecing and it's slow and dreadful but hey it's better than being separated and not talking. You need to get it all out on the table to know what to work on and that may take some time to sort out. So can you get him listening and talking? It takes two. You are working on your reactivity. Great! So are so many of us here. But what is he working on so it can be a true partnership?