Nestlee...I agree with headdesk, he is emotionally abusive.
I will be honest my WH has been that way for years. Since before his EA my response is always the same...stand and passively listen to his verbal diarrhea and then very calmly ask him "are you done?" When he doesn't know how to answer I then very calmly say " if you are that unhappy with my _______then you know where the door is. Don't let it hit your ass on the way out!" I then turn around and leave the room. He usually stands there gaping and then tries to backpedal I ignore and go about my business, sometimes I just leave the house altogether and go for a walk.
I learnt this from alanon. It is called detachment and the less I show emotion or become argumentative the less the behaviour occurs.
An alcoholic will use the fight as a way to justify drinking. I believe the same applies in an A situation. The WS uses the fighting to justify going out and having an A. You know the story " I had to find someone to comfort me my spouse and I fight all the time, my M is awful.
My advice, approach this in MC by asking directly if he even wants the marriage. Maybe it's not just you maybe he is looking for an excuse for an exit A and your coming home moved the timeline forward. You won't know until you ask the difficult questions.
For me my WH emotionally abusuve behaviour has all but stopped since the end of his EA. I asked the hard question of did he even want this marriage. He was horrified I would even ask, so I sat down with him and layer out how his behaviour and emotional abuse would lead me to believe he feels I am not good enough to be married to and that since he had an A then someone else might make him happier. If that was the case he could leave no harm no fowl our lawyers could sort out the property! He started IC the next day.
Good luck whatever path you decide to take