Yes, it's very normal for the MLCer to turn their back on you after years of contact, etc. Even though it appears that a switch was flipped, it didn't. Your EX began his journey about 18-24 months prior to the bomb drop and it was so gradual that you probably didn't really notice the changes taking place.
Your mantra needs to be: It's all about him. I didn't break him, therefore I can't fix him. I need to focus on myself, take care of myself and ensure that my financials and assets are well taken care of.
If you haven't already done so, please begin reading some of the postings in the archives. I think you will be surprised at home many feel the same way that you do. It will take some time to detach and once you have done so, the rose colored glasses will fall away and you'll begin to see just how crazy he can be.
It's a long journey...a journey that is not for the faint of heart, we call it a marathon, not a sprint. So, buckle up and get ready for the ride of your life because it will get worse before it gets better.
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.