You have not made a knee-jerk reaction, you have knowledge and you made a decision, it is not for anybody else to judge that decision.
I have been with you through all your ups and downs since you came on this site and have hoped that your husband would change his life in accordance with the teaching of his rehab but he doesn’t appear to be prepared to accept and change. I agree with you that it doesn’t matter if other people think that porn is an addiction, or not, the fact that your husband does, means he is accepting that he is relapsing into behaviour that is unacceptable.
You know better than anyone the problems your husband had growing up with the lack of good support from his parents but he has now been into rehab, seen psychiatrists psychologists, is in 2 GA groups and had your loyal support – I can’t think of anything more you could do.
I could and would never say that I thought it was right for anyone to stay or leave a relationship but I am of the opinion that limits are reached and it is right to acknowledge them and not pretend they do not exist. I would be doing you a disservice if I did not admit that I reached my limit and that if estrangement had not taken place, it is probable that nothing would have changed in my life or my CGs.
This is another painful and difficult time for you B. The future will seem unclear but focus on your health and the happiness of your children and live one day at a time.
I hope we get longer to talk next time but until then I wish you well.