I think you need to examine your own personal narrative around this whole disaster of your marriage.
Others have said you have codependent characteristics. I think they are correct and I think it is imperative that you learn about codependency and how it is harmful to both you and your relationship.
Codependency is a way of putting YOURSELF on a pedestal as the helper, the good person, the knight in shining armor, the one who rises above, who forgives those who hurt them, who takes a lickin and keeps on tickin.... you get my drift.
Your image of yourself, as who you are, in relationship to your wife, becomes so unbalanced and unhealthy that the relationship becomes dysfunctional.
Oh, you take responsibility for your actions? How noble.
Do you also REQUIRE your wife take responsibility for her actions? No? Well, that's not kindness. That's actually harmful to her. You stepping up and forgiving her so easily makes it too easy for her to never do the hard work required to face her shameful behavior and take corrective action.
You cannot nice her back into wholesome, honest integrity.
You being nice and forgiving about this actually sets her up to never make herself whole and never repair her own character flaws. And for you to live with someone who then has no honor.
I'm sorry if this is a 2x4 but I was the worst kind of codependent and I realized that my WH was in part the way he was because I allowed it. I allowed him to emotionally abuse me, betray my trust, and tear my life apart. I couldn't reconcile with him because he wouldn't fix himself. And I wasted years hoping and trying to do his work for him so that I could have my marriage back.
I was the strong one. The honest one, the forgiving one. And I got USED. Somehow, I thought that made me a better person but all it did was send me into the worst depression ever.
FBW then 46, XWHNPDPAFTG the destroyer of my entire life. D-Day 1 '99, D-Day 2,3,4,5,6... '09-'11, D '15. I fell apart. I put myself back together. Forgiveness isn't required. I'm happy and healthy now, and MY new life is good.