I wasn't willing to be fully transparent about the actual depth of my betrayal and spent years TT until I finally came clean about 5 weeks ago
I won't hammer you on this point because I assume you already know it was a problem. I just want to point out that to her, this meant a few things. I meant that you were still putting your own best interests before hers. It means you were still willing to lie to her, which is what happened during the affair, and so even if the affair itself is over, the betrayal continued until fairly recently. So her experience is that nothing about you has changed. And if the affairs all occurred before marriage, then you were betraying her even since before the beginning, if you know what I mean. Essentially, her entire relationship with you has been a lie, at her expense, and you've done all you can to cover your ass while she takes the full brunt of the consequences.
Again, I don't say this to you to be mean, not at all, rather, I want to help you to get into her head. You need to be able to see yourself through her eyes, and understand that infidelity is not as simple as "he slept with someone else and lied". Rather, for the BS, their entire world becomes a lie. They don't know who to trust, because if the person that pledged to love and protect them for life was busy having sex with someone else while making those vows... then anyone could betray them. Then they start to worry about what else you lied about. They question every moment ever spent together, every word ever spoken by you, where you were, what you doing, the money you are spending, even who you think of when you close your eyes... It is so bad that they actually coined the term PISD (Post Infidelity Stress Disorder) which honestly, is just a form of PTSD.
In regard to "getting it"... what I found helped me the most, in the long run, was a combination of IC and MC. IC was the first crucial step, and it had to occur before MC for me, because in order to understand how my wife felt, I first had to understand myself and my own feelings and motivations. I really had to go back and dig into my personal traumas, and figure out how those affected me in such a way that I allowed myself to become a liar and cheater. No one says, "I want to grow up and be a cheater one day!" when they are a kid, and yet, that happened, right? So we need to figure out HOW and WHY that happened. Once we understand ourselves better, we can go back and correct some of the broken shit in our heads that got us to where we are now. In essence, we need to decide who we really want to be, and then learn how to be that person. Do you want to be a truthful, authentic, empathetic person who people trust and admire? If so, then you'll need to learn why you lie, and fix it, and become someone honest (for example).
Let me ask you this GR21, off the top of your head, do you happen to remember any emotional trauma in your life? For example, were you abused, neglected, teased, abandoned, molested, raped, demeaned, left out, pressured, or ignored when growing up? If so, start looking there. How did that actually affect you? Did you compartmentalize those feelings? Have you clung to a victim role? These are random questions just to get you thinking. Talk to your IC about them if they apply.
You need to heal yourself first. The fact is, we cannot love another until we love ourselves first, and if we are willing to lie to, betray and manipulate others to get our way, then we most certainly have no love or self-respect for ourselves. So that has to exist before you can even begin to "get it" in the way she's asking you to.