DSL,
It sounds like you may have found one of the really good MCs out there, so that is a very encouraging step forward! I'd also recommend the following books for you...
"How to Help Your Spouse Heal from Your Affair" (MacDonald) - great for both of you to read if she will, but good for you alone as well just to help ground you in what you should expect to see from a truly remorseful spouse
"No More Mr. Nice Guy" (Glover)
Finally, I want to share a bit of my own story (ultimately just to get to the points at the end)...
My W first cheated only a couple years into our marriage. She indicated it was because she was looking for attention that I wasn't giving her, but she was so sorry and confessed what had happened. Within a year we had our first child and eventually grew our family further. When our oldest was in grade school, she had an EA took some time for her to admit to and stop. But it was the same thing -- she wanted the attention. Then it wasn't until our kids were in Jr High and High School that she had more EAs and PAs (several with different men, but with the same "attention/approval" reasoning). The last one was with my BFF who was also a neighbor with both of our wives/kids being close friends as well. I first noticed that they were texting excessively and confronted both of them along with informing the OM's wife thinking this would put a stop to an apparent EA. A couple months later the OM's wife found that their interactions hadn't stopped and that it was a full PA. Same thing -- she enjoyed the attention.
In the days after discovery, I went into damage control mode -- I setup a MC appointment, found ICs (even recommended some to my "BFF" and his wife), looked for other forms of support, informed our in-laws (who lived in the same town) of our plight. Prior to discovery, I largely carried the load for the family -- had the career that paid for all of our expenses, took care of the finances, house and cars, tended to the children, made the meals, etc. After discovery, I continued with that and all of the chaos of the new stresses. I also started to look at the possibility of moving out of the area -- having the OM so close made things difficult while my father's health had just taken a bad turn and could use some support.
During the initial days post discovery, my W and the OM didn't fully cut off communication. When my W did, the OM tried finding other ways to reach her including crossing her path in town. My W grieved the lost relationship and was sullen. When the A became more widely known, my W became even more drained as she was filled with shame and guilt. Her parents ended up actively opposing my direction of moving away even to the point of trying to manipulate our kid's into opposing it with ideas like "but my friends are all here" and "my school is here" and "what about my sports activities?". I carried her, our kids and our lives through that.
I made a stand about how I needed to be away from our location including an OM who lived a few houses away along with other men who lived in town that were previous EA/PAs. In addition, I received news that my father's health had taken a turn and it wasn't know how many more months he would live. My wife and in-laws opposed that direction. They said "But he is just going to die anyway - why move?", "The kids would be better staying here" and "It isn't that big of a deal that the OM is a neighbor because the A is over." I ended up transferring jobs and moving away all alone to support my parents.
During the time apart, my W and I worked with our own ICs. During that time, I came to see that my W's rationale of "I wanted the attention" wasn't a statement about me failing to give her more (I had been carrying everything already), but that the common thread was her. My wife made some big strides too -- through her own shame/guilt, recognizing that she was broken and then seeing the destruction she had brought on herself along with me. Eventually, over a year later, my wife and kids ended up moving to be with me. Over the course of years since then, I ended up going through multiple ICs -- one for EMDR treatment, another to unravel my own codependent patterns and another to help drain my feelings of worthlessness and the false assumptions I had carried about myself from childhood.
A summary of some of the impact of this...
1. Being a nice guy and carrying everyone else prevented me from starting my own healing for a long time and, I believe, has led to a healing process that has been slow and lengthy
2. In being nice, I was opened up to and accepted far too much abuse from my wife and from my in-laws
3. With the exception of the last A, I avoided telling the AP's spouse only to see more damage emerge from the wayward spouse that didn't have any consequences
4. My wife's core challenges that led to her chasing approval/attention ultimately were linked back to her upbringing/parents
5. My kids weren't oblivious to what happened, even though they were only in their lower/mid teens, and my modeling of being "nice" has led to some challenges of their own not that they are older
Now for the two points I'd like to convey...
1. Post discovery is absolute craziness and it can be really, really difficult to take some steps or even to just get to a point where the mind will accept some ideas (e.g. if the marriage ends, it will be ok). Some people seem able to move quickly and others just really struggle with it and it takes longer.
2. Those who are here on SI (1) know the pain and (2) have often been around SI long enough to see the patterns that play out. While there is a spectrum of how SI members communicate and even a range of thoughts/approaches, what you should see in it all is that there is a theme of trying to help you move as quickly as possible to help you avoid as much pain as possible. Especially in Day 2 of this thread, I think that is a key point for you right now.
So be kind to yourself for where you struggle, but also do what you can to take in some of the advice that is being shared with you. If you can't process as much advice as you are getting, it is OK to step back. If you think some isn't well founded or doesn't align to your situation, it's OK to leave it alone. This place is meant to be one that helps support you in the middle of the chaos and helps you advanced bit by bit towards surviving the infidelity you've experienced. Hang in there, DSL!