I wanted to say more yesterday, but I was on my phone last night and it's a pain to reply on.
I can see her manipulation, as can everyone else here. Every single time the conversations get hard, she gets upset, and you end up being the one comforting her. WHY WHY WHY!?!?!?!?! Her IC needs to be doing that, not you. She should be groveling at your feet right now. She should have read the book you asked her to read immediately, and in a day or two, and then asked for another. Everything she is reading should be about affair recovery, or books like Not Just Friends.
Again, have the STD tests been done? If not, WHY NOT? They obviously weren't using protection. This must be done.
GENTLY, you are the posterchild for codependency. Please read up on that and watch youtube videos, whatever you need to understand this and break free. It might take some time. It took me 2.5 years to come to terms with it and break free myself.
Now, I am going to yell at you. Please please please hear what I am going to say.
YOU CANNOT SAVE YOUR MARRIAGE BY YOURSELF. YOU DIDN'T BREAK IT. SHE DID. SHE HAS TO DO THE WORK AND SHE HAS TO LEAD THE WAY OR IT WILL NOT BE TRUE RECONCILIATION. JUST STOP. STOP.
If you have to push her to do it, it isn't genuine and it won't get you anywhere. You can set your requirements and your boundaries, but you cannot nice her into following through. She knows you love her, Bahama, and she is using that against you.
Watch her, see what she does, do not listen to what she says (well, maybe a little but with a cup of salt). These will probably be two totally different things.
Also, as a SAH parent to another, get a job. It will help you with the 180 to be busy, and if this marriage doesn't work out, you will already have an avenue of income.
I know how hard this is, I do. We all do. I know how tempting it is to believe the best, and to be optimistic. I'm not saying don't do that. But, please remember what your wife is capable of. Was she sobbing about how terrible and guilty and lost she felt while another man's penis was inside of her? I think not.
If you haven't already, read LtCdrLost story from the beginning. He handled his situation like a real man, and it was very attractive to read. Hear what I am saying here. Take charge.
Kudos on not sending that letter. I couldn't even finish it.