BarelyBreathing,
Many have described year 2 as the Plane of Lethal Flatness (POLF). It’s when the shock and anger and all that adrenaline and energy dissipate. You are left with the acceptance and disappointment that this DID happen. Your spouse did this. So now what?
Thank you for posting and sharing this information. I did not know this at all. I just recall reading that it took about 2 years to "get over" the incident. But I guess, like many things, the POLF got lost with time. 
Sisoon, 
 Two years out, my gut told me R would succeed for us, but I kept telling myself not to be over-optimistic. It wasn't until 3.5-4 years out from d-day that I declared myself to be healed enough. 
I understand the portion of not to be over-optimistic. That's something I'm currently at. Not trying to be pessimistic but letting actions be the determining factor of everything. 
Oldwounds, 
 It may have been me that mentioned building up some emotional walls, my IC/MC told me if I wanted to get the relationship I wanted, I would have to find a way back to vulnerable. I think the walls are something every one us retreats behind at some point, just to rest and recover. The brain protecting itself is fairly natural to me.
I can say, getting back to vulnerable is the hardest step for anyone trying to stay in the M. 
Like you said, I think it's only natural to build up walls after suffering trauma. I know at some point I have to bring those walls down, but I do think it's a little too soon, but idk. Was there anything specific you did that helped bring those walls down? 
Asterisk, 
My wife went back to college and came out 5 years later with her Master’s Degree in psychology and a new career path while I opened my own business, one I would enjoy every day until I retired. Reconciliation achieved! And then…
If I may ask, how did it feel with everything going on between you two to start something new like opening a business or going back to school. I would imagine both are great stressors in a relationship as it is. Would you say you had more stressors given the A. I ask cause I have thought multiple times to move to a different place of employment for more pay and opportunity. While the process of going to a new thing is nervewracking as it is, it's definitely another stressor to be added to reconciliation.  
Oddly, I know it doesn’t appear to be the case but our marriage is loving and strong, these days it is me that is the weak link.
I fear, that is what will be my case as well. It's really hard move forward, but based on many of your posts and others, it is very possible. Unfortunately, some things just take longer than anticipated is what I'm starting to realize.