Why not thank God for your enlightenment and happiness? If you are feeling truly blessed, instead of a thank you phone call of letter, why not say a prayer for her? No good will come of a "thank you". Not for anyone. I will be facing my ex for the first time in 15 years at my sons wedding. There was a day when he'd have stepped over my dead body for a beer and a line if coke. He still uses and I have no doubt I'd be dead had I stayed one more day with him. I will not thank him because he was no help to me at all. I did the work not him. I made the tough choices, not him. I walked it out, not him. Your life should be one of gratitude and a new appreciation for the simple things, I'd continure forward and leave the past where it is. I believe you can change your good karma with hurtful behavior. I know how great it is to find out you are sane. I'd just go forward and live a wiser life.