The ultimate irony in my mind of all this is that if she dumped me before we even got married, I would never have blamed her. I was absent, neglectful and completely 100% self-absorbed in what I wanted to do - and she married me anyway...
After we got engaged, I slowly started to realize that I was contributing to a lot of negativity in our relationship and started to change all of the above. Apparently the changes weren't fast enough for her or she just couldnt let go of the past or wanted a 'cleaner' relationship with no past issues. What a great way to do that by choosing a relationship with an AP...
To me, that sounds like you have an awful lot to be grateful for. Regardless what happens to your M, YOU have grown. You get to keep that. You get to take that with you into your next relationship, whether that's your W or someone else.