NM, I really think you're doing great. I thinking kicking your SO out was a good move for you, just like it was for me. It made detachment so much easier, helped me work through a lot of my hurt and anger, and helped me focus on GAL and get off the daily rollercoaster. Now, after being completely dark for three weeks, I'm able to DB effectively.
I'm glad that you're sticking to your guns about not ML. Since you made the decision, you have to stick to it. That one thing is clearly going to drive him crazy more than anything else.
Also, I think it is very good that his parents know. At first, my W was very angry that her parents and relatives "took my side" instead of hers, but that has gradually developed into her feeling depressed because she doesn't feel like part of her family anymore and she misses the relationships she had with them.
I think that anything (other than you) that adds to his emotional distress is good. He needs to be as depressed as possible. Being depressed will help him realize how good he had it before and missing that is your best hope.
The LORD is near to all who call on him, to all who call on him in truth." (Psalm 145:18)