Try to be gentle and kind with yourself. If you had heard someone ran from a burning building to save themselves you would say they were crazy, if that person was feeling guilty for not taking water from the tap to put out the building from inside the house. You had to leave to save yourself.
I left the same situation. My XAH was a very well paid highly functional A. But he smashed out the man I married with alcohol. He admitted to me he had a problem but decided not to do anything about it. Once you are away from the situation for a while you will start to see the entire situation I a new light. It is OK that you broke free to help yourself. Try to release the guilt....
4MyBoys