If I've read your thread correctly, you already HAVE??
I'd apologize for things only ONCE, and then move on. When confronted by her again with your past sins, say "I've already acknowledged my contributions to the dysfunction in our marriage, and have even asked for your forgiveness. And I'm working very hard to improve myself in these areas, whether that ends up being for us or just because it's the right thing to do for me as a person. But I'm not going to keep letting you badger me about my faults, because it serves no purpose. If you stop this flight of yours, and come back to our marriage, I think you'll find me ready and willing to work on all issues -- even mine."
See how the above is STRONG. Repeated apologies are supplicating and WEAK, and she won't respect them.
