Root,
I'm sorry your in so much pain. It sounds like you have an unhealthy dynamic going on at home, hopefully I can provide a little of what might be going on and some experience.
As I look back on those days I think the EA was a good solution. BH was happy. I was happier. It was win/win to me. I know people say how would you feel if BH did it to me. I’d be livid because I was here still trying to get his attention. I asked him what was wrong. I wanted to talk about it. BH didn’t want to.
You might as well have taken that, word for word, from the WH's I know. "Wife didn't want to have sex". "Wife was happy I left her alone for sex during the A". "I was happier". "Where's the harm".
Except, I suspect when you think about it as your H having women he sleeps with on the side, it's a very different feeling that what you feel looking at your "win/win" situation. Of course you were happier, you were scarfing cake.
Everyone likes cake!
The problem is, it's a temporary state of being. First off, it's unlikely your relationship wouldn't have gone PA at some point, they usually do, and then you would had hurt your H much worse. For at least some people, and I would be one of them, an EA is a speedbump, a PA is hitting a brick wall at 100MPH. I suspect your H is one of those people because of his reactions, not too mad about the A, livid about you having sex with someone else before you were married. I'd feel exactly the same way, if my W, at d-day, had said "we never saw each other, it was just e-mail" I doubt I ever would have found this place. Probably would have asked for MC to get to the bottom of it, but, honestly, I'm not even sure I would have done that. An EA just was not a big deal to me (and, if I'm honest, still wouldn't be to me if I'd never been to SI and see the destruction they caused to some people). So, in your case, I suspect your "big dark secret" (the EA) was a minor blow to your H, but your "PA" from years ago, that blew his world apart. We never know how we'd react in different situations, but, if my wife had the same story to tell, I suspect my reaction would be more similar than not to your H's.
She kinda figured it out but sided with me because she blamed BH for me being bedridden with depression. To this day she jokingly calls
herself a ho and says she wants to be a stripper when she grows up. I haven’t been the same since d-day so there is that. She still blames him.
This is unfortunate. Your children shouldn't be "siding" with either parent, they shouldn't be involved in this at all. But, since it's done, IMHO, the right thing to do is explain to her "It's not your Dad's fault, it's mine". Because this would be a major issue for me. My W's family all sided with her (because she told them bad things about me and conveniently forgot to mention, oh yeah, I'm having an A) and it was a big problem for our R. I didn't make her tell them about the A, but I did have her talk to them and explain that it was not my fault. Having people around who are blaming you for something that you didn't do is really, really hard. But they don't need all the details, my W's parents still don't know about the A, but they know that it wasn't "just me" being an asshole. And that makes things much more comfortable for me to be around them. I suspect your H is dealing with the same issue; you cheat, and my daughter is mad at me? How's that work..
I'm sorry your in this spot root. Lying is never the right answer for how to fix things. Be honest, be authentic and let the cards fall where they fall. I know, easy to write, hard to do. But strive for that.