If only I had fixed myself it wouldn't have happened
Nope. Noway. No how.
Why won't you accept that your H is 100% responsible for the A?
He had other choices. He really did. I can think of at least 5 options right off the top of my head.
Heck, out of all the possible AP choices out there, he chose a friend of yours?
I see you are having a great deal of difficulty accepting the first and most important aspect of an A. The person who has an A is wholly and fully responsible for that choice. There is NO and I mean ZERO, not even a percent of a percent of that decision that falls on your shoulders.
Where did you learn this idea that when someone wants something from you, it's your responsibility to give it to them? Its your choice and your right to give it if you WANT. Just because someone wants something does not mean you are obligated to give it to them on their terms. I don't care if it's sex or ice cream. You can say no as you are not required to give it on anyone else's timeframe.
This is part of the permission process that Sisoon was talking about.
You are a human being with wants and needs of your own.
You are not a tool for someone else's pleasure or need fulfillment.
You have permission to say no, free of guilt
You have permission to say yes, free of guilt.
by the affair though he took responsibility
By the Affair he took an available avenue to please himself.
Selfish, impatient, deceptive and controlling action is not responsibility.
You are accepting responsibility and feeling guild over your WSs choices and behaviors.
Codependency.
Have you looked into this with an IC or read any books on the topic? I know there are some great books on the topic that are often suggested here.
I haven't personally read them, so I am hoping others can make some suggestions regarding the most helpful titles.