Please contact a lawyer and see what your rights are. The more knowledge you have about your situation, the stronger you will feel. Oh, your h will continue to make threats, but once you know your rights, if he threatens you, just look at him and walk away because you will have info that he doesn't know you have.
MLCers do not like to be told what they can and cannot do. The more you tried to reason w/him, the more determined he will be to do the exact opposite.
Remember... you didn't break him, therefore, you can't fix him. You can only control you and how you react when he "monsters". He knows you well and knows exactly what buttons to push...take that knowledge and try to change the way that you react to him. Once he sees he can't push your buttons, he may very well cease doing so. He's like a 2 years old testing the boundaries of "mom" and the more you react, the more that baby is going to act up. They love attention, i.e., be it positive or negative.
I know it's difficult to deal w/him at the moment, but I know you can handle this. Keep the focus on you, do the best you can when it comes to him and trust me, it doesn't matter what you say or do, he's going to have a reaction. When he monsters, walk away...you do not need to listen to him. Being a bully is all part of the MLC journey for him. He feels threatened and when they do, they come out swinging.
Knowledge is power...take that power he has over you and toss it aside. See a lawyer and find out what your rights are. It's important that you do so in order to have some peace of mind.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.