You are such a strong and inspirational example of what it means to put yourself first and to keep moving forward.
It is hard to leave someone who you shared so much of your life with, especially when he seems to be showing more of who he used to be when things were good. Unfortunately, as you already identified, it won't last and sometimes two people just can't be together in a healthy way.
Keep moving forward, this was such an inspiring post that even when you are hurting you are still able to see the situation for what it is and put your needs first. I hope to be so clear headed one day.