First, all of this and more:
This is big time trauma. I cannot imagine how you must fee[l].
I agree, get support from your sisters and anyone else that is close to you.
And, I also agree that your husband's alleged guilt has nothing to do with any mistreatment of you.
This guy has big time character flaws.
I agree with Chamomile Tea except for this:
And even though we all recognize that newborn OC's are innocent, this 30 year-old woman didn't pause for a second to consider what kind of damage all this might do to you, the unsuspecting wife. For one thing, not all betrayed wives will accept contact with an OC. That's a choice which YOU get to make.
The whole thing sucks. Terribly. For you and your kids and the OC. I simply cannot imagine - but please don't take this out on the OC (it doesn't sound like you are) but Chamomile Tea's comments make it sound like you are in some way more important in this whole thing than the OC, and that's just not true.
You and the OC have much more in common than you realize. Just as you have just found out about your WH's history and the betrayal you have suffered at the hands of someone who is supposed to have your back no matter what, the OC has also just found out that the life she thought she had wasn't reality, and that her parent was the one that betrayed her. She is stuck with your WH being her biological father - much like you are stuck with him being the biological father to your children. This is a BIG deal - and I do recommend that you go to the "I can relate" forum as talking to other people who have lived through this can only help you.
My mother had and A, and my half-sibling is a result of that - the dreaded OC. I would never, in a million years, tell my sister that she had to be careful about her biological parent's spouse's feelings in regards to contacting her father. Luckily for her it was not a secret by the time she was old enough to remember...but but but...that's too big of an ask IMO for someone in that position. My mom ultimately married my sister's father, and he had two children from his first marriage that he had physical custody of (his ex was a nurse and worked overnight shifts so it was easier for the kids to reside most of the time with him). His kids, and me and my other sibling were all my half-sister's siblings - she grew up with us - and she attended their graduations and weddings etc along with the former OBS, and as far as I know, no one made it "strange" for her. In fact, she went on a vacation with my step-siblings and their mom (the former OBS) at least twice I can recall, as did she go with me, my other sibling, and my Dad on a few vacations.
When all of this happened with my mom, and I was pissed off as my mom-s A was a huge secret - we didn't even know my future step-father existed until they had been having an A for 2 years! I wanted nothing to do with her future child and I made no bones about telling her that - I was absolutely going to hate her in my mind. I was a teenager, and one of the things that has stuck with me my entire life from that time was my Dad telling me this when my sister the OC was born: This is not your sister's fault. Do not do yourself the disservice of treating her in a way that is disrespectful as you and I both know she does not deserve it...be as mad as you want to at your mom, but that's as far as it should go.
There was more, but at that moment I made a decision to really grasp that, and know it. I made peace with it at that moment. My mom and I had our issues but my half-sister and I never did, and I am grateful for that as I know it would have been wrong to do so.
Unfortunately, it's not a choice you get to make as far as contact versus no contact with the OC - it's a choice she gets to make first, and then of course your WH's choice about whether or not to see her. If you give him some kind of ultimatum about contact with her, I can't imagine that will make you feel any better, and it won't be helping her - the other innocent party. I understand that you have been hurt and so has she. It's a shit sandwich for both of you. Navigating this, and the whole host of feelings that go along with it, will be difficult I'm sure.
All that aside, if you feel like you want to separate from your WH, then you should. Honestly I don't know what would bother me more: the A and the lies or the fact that he was pretty certain his own daughter lived on the other side of the fence from you and he ignored it. Who does that?
I'm sorry you're here - I can only imagine how you must feel right now.
[This message edited by ThisIsSoLonely at 4:13 PM, August 27th (Thursday)]