My journey into infidelity began with my ex's separation. It is a journey that I will continue for the rest of my life. Divorce did nothing to get me out of infidelity. I indeed have to share my fatherhood with a AP "step dad." My kids are young enough that they do not understand what has been taken from me by my selfish monster of an ex. I walk that road alone.
My XWW’s infidelity was a total horror show in that the depth of lies, the coordinated, carefully thought-out deceit, and the severity of her backstabbing were just mind-bending.
Her reaction and behavior after getting caught were legendary in how she was just heinous in her blameshifting, demonizing, trickle-truthing, marital-rewriting, meanness, cruelty, etc, etc.
Among the emotional storm of pain, anguish, sadness, mind-movies, fear, confusion, and anger - what became the biggest problem for me was that not that, like you stated, my entire relationship with her was a lie, but that I was still married to this lie.
I was frightened to death of being a single father, but that was better than remaining married to a total fraud of a human.
Just filing for divorce was a liberating feeling as it started the freight train rolling in barreling out of her sick world of selfish addiction bullshit.
Divorce indeed gets you out of the infidelity because being married to a woman who is providing sex-for-compliments with some scumbag while vilifying you is about as healthy for you and your children as skydiving without a parachute.
My XWW is remarried and I do not share my fatherhood with her husband.
I spoke with my children and told them that I am their father and their ONLY father and the the man she is married to is simply the guy she is married to.
There is nothing anywhere on earth or anywhere else that states that he is a co-father to my children.
If she divorces, then he simply reverts to being a guy she was married to - whereas, I am their father no matter what.
They know this and agree completely.
If my ex was a decent person, she never would have dated nor married me. But she isn't, so the entire relationship was a lie because it suited her selfish interests. Frankly, once she married me and had kids with me, I might have preferred continued lying about her true feelings than her "integrity" and "honesty."
Preferring that she continue to lie to you would not make anything better for you or your children.
You would still be living a lie and living an illusion.
I would rather my children watch me struggle as an honest man than watch me pathetically live a lie that they will eventually and surely find out about.
I understand and sympathize with wanting a whole family but a family that is based on lies and deceit may appear outwardly pleasant, but inwardly rotten and empty.