I'm scared of appearing as anything less than the perfect and remorseful spouse. I'm scared what my spouse might think when my thoughts and questions only point out further just how incapable I am of intuitively understanding her needs, or reaching outside of myself to see things clearly.
As long as you're expecting yourself to be perfect, you're setting yourself up for failure. No one is perfect. The important thing to do is to strive to do things to the best of your ability, and to have compassion for yourself and a willingness to learn when you fail.
When you are trying to be perfect you are letting shame control you. Shame is there saying "not good enough". Getting to the root of your shame and working through it will help you build compassion and empathy for your BS, which in turn will teach your to be more selfless.
I don't want the world to see that I freeze like a deer in the headlights when confronted with the affair.
Why does it matter what "the world" thinks? What does "the world" have to do with any of this? When you are focused on what others think then you are letting shame take the wheel. It sounds like you think that your inner critic will go away with the approval of others, but that's not how it works. Doing the work on your shame is the only way to stop worrying about what others think.
those walls
Walls are built when we are scared. We are scared about what will happen if they are not there to protect us.
The one thing that helped me with my walls was listening to Pema Chodron's advice of moving closer to them and getting to know them. in other words, getting to know what caused me to build the walls to begin with and what feelings I was trying to avoid and run away from.
It is not that I deny my actions or how awful they were, and there is no shortage of shame and guilt. What I seem to lack is the ability to really "own it" in terms of accepting the guilt on a deeper, heart-felt level. I want to. I need to. So why can't I?
As long as you are holding onto that shame you will never be able to look beyond yourself. If you can't do that then you won't be able to find empathy for your BS and you will not be able to grow as a person.
How did you manage to get past the selfishness and the shame? What was your aha moment that allowed you to put down the walls and open up? How do I get over my own feelings and make hers the priority rather than mine?
Once I learned that the root of my selfishness was my shame I began to work on that. I read all of Brene Brown's books and listened to her tedtalks over and over. I started being more vulnerable with my BS. It wasn't easy at first, but I knew I had to push through my fear.
I learned to be mindful, which really helped me to stay in the present and change my thinking.
I read and listened to a lot of books and watched youtube videos. Not just once, and not just skimming through them, I would keep listening and reading until it really sunk in.
Some of the stuff that helped me was
'The Places That Scare You' and 'Don't Bite the Hook' by Pema Chodron
All of Brene Brown's books and videos
'Shame and Guilt: Masters of Disguise by Jane Middleton-Moz
'The Four Agreements' by Don Miguel Ruiz
Kristin Neff's website and videos about self-compassion
Until you really deal with that underlying shame you are going to feel like you are spinning your wheels and you are going to create more damage in your relationship and cause more harm to your BS.