Riddle me this

If you truly think what you are doing is the right thing, and that you have your children's best interest at heart, then why lie?  Why hide it?  Why go to extraordinary lengths to cover up what you are doing?  Because you know it isn't right or the best thing for the children.  You know she is not fit to be in my children's lives. 
If you truly believed that she was, you would not lie or hide.  You would do the mature thing and sit down with me and say, "I know this is not the best situation, and what I did was the shittiest thing any human being has ever done was not right to you or fair, but we are going to be together.  What do we need to do, to show you that we are fit to parent these children and be role models?"  Instead you lie and deny.  Because at this stage, neither of you are mature enough.  All I have seen from either of you is lying, stealing, cheating, immaturity, rash decision making, and irresponsibility. 
You think after the divorce I will just go away?  You are stuck with me forever.  We have 4 children together.  And I will continue to fight to protect my children from your midlife crisis whether the divorce is final or not.  Don't think I can?  Just watch me.
Because while you have been busy playing house, acting like a teenager, and shrugging off every bit of responsibility that you have, I have been researching.  Reading. Studying.  Making Phone Calls.  Conducting Interviews.  Doing everything within my power to arm myself with the knowledge necessary to protect my children.
This could have gone an entirely different way.  I wanted this to be civil and I have given you almost everything you wanted, all I asked in return was honesty and respect.  You cannot give me either.  That speaks to your character not mine, and that is not the influence my children need in their lives.
The two of you are poison for each other.  Since you two met you have neglected your families, neglected your friends, lied to everyone who cares about you, done drugs, underage drinking, snuck around, made poor decisions, and thought little of anything in your lives but each other.
It is the unhealthiest codependent relationship I have ever seen.  The girl with daddy issues and the daddy going through a midlife crisis.
GET A GRIP!
You are so delusional to think you can walk out on us, for another child, then move that child in with you, and plan and work to purposely get her pregnant. You are sick. You need help.

You will not win this war, and that is exactly what you have made it.  No you do not scream and curse at me, but that does not matter.  What you do is far worse.  Do you see how many lives you destroyed, including hers?  You do not think she will grow to regret alienating everyone in her life, and resent you?  Do you not think you will one day resent the loss of your family because of her.
You are the only two people in the world who do not think what you are doing is insane.  I wish you two the best of luck.  Go have a ridiculously insane life.  Just keep your crazy away from my children.