I will offer advice but it is nothing compared to what the "regulars" of this board can tell you. They are saints and much more experienced with this type of thing. I am in a similar situation with my wife since July, to which yours sound similar. I will share what I have been told.

Understand This is not your fault. It is difficult to grasp but true. You did not break him so you cannot fix him.
He will say things that blame you for everything and point out your character flaws. You may even get blamed for the color of the sky on any particular day. The best action is to deflect and not let him see it visibly get to you. Go in another room and unleash if you need to. Do not argue or even acknowledge the daggers he throws. Try and give an empathetic response when a bold statement is made (like "I love you but not in love with you"). Examples are "That must be difficult for you" or "That must hurt inside." NEVER give a rational answer to an irrational statement. Use the above technique.

There will be good and bad days for each of you. Do NOT let his moods/actions control yours. I let that happen to me for far too long. It takes time but you will get there. If you do let it get to you, they will continue indefinitely. Think of him as a teenager, which is where his mindset may be. Any statements that are contrary to his wishes right now will be met with intense lashing out (which is what a teenager would do).

If it is true MLC, he realizes what he is doing but buried so deep in his brain, which is flooded with new ideas/adventures/thoughts that it will not bee seen until the awakening, which can take a very long time.

Write down your boundaries for what you want with regards to behaviors, conversations, actions and anything else that is important to you. Keep it handy and you don't necessarily need to share it with him. There is a good thread regarding boundaries somewhere on this site.

Do for you. For yourself, exercise, eat right, get in shape and dress nice-even if just going to the store. It will help you feel better and will prepare you for whatever happens in the future. Find a new hobby and channel that negative energy there.

Pleas keep us filled in, there is an outstanding community here.