So sorry you had to find us. One thing that happens often is that the WS rewrites the marital history. I would bet that the issues in the M that he was discussing happened around the same time he was cheating. It's trying to justify his bad choices.
Try to stay hydrated and eat, even if it's protein shakes. If you have trouble sleeping, you may need to talk to your doctor if over the counter stuff doesn't help.
Nothing you said or didn't say, did or didn't do, acted or didn't act caused him to cheat. He cheated because he has something broken and he didn't choose to honor your marriage vows.
There are two books that I recommend. One for him (although you can read it) and one for both of you. First, How to Help Your Spouse Heal From Your Affair by Linda MacDonald. It is short and can help provide a blueprint for what he needs to do. Second, Not Just Friends by Dr. Shirley Glass. Her chapter on windows and walls is very helpful for those trying to understand good boundaries in relationships. There is an assessment that you can take to see if a relationship is crossing boundaries or not. The windows are between you and your spouse so that you are transparent with each other. Walls are set up between people outside your M because there are things that they should not see.
Intimate partner betrayal trauma is some of the worst there is. It is the most painful thing I've been through. You can survive. It just might not feel like it at times, but you can survive.
ETA: There are no really good statistics that show the percentage of relationships that survive infidelity. Reconciliation takes a lot of work from both partners, and each of you needs to be 100% committed to changing and making it work. Unfortunately, one partner isn't able to be all in.
Often, it's the behavior afterward dday that causes problems. More lies, more cheating, more secretiveness, etc.
[This message edited by leafields at 10:37 PM, Wednesday, June 14th]
BW M 34years, Dday 1: March 2018, Dday 2: August 2019, D final 2/25/21