Yes she's in love with her feelings, so how do you get to her, do you disagree with her feelings that she's justified, wouldn't that make her reject you evening more.
I would agree with her, "You're right, you're justified in thinking this way, I was wrong, I should have done better, I guess that's why things are over between us"
"You're right, you'll never be able to trust me, I let you down, I should have done better, I was dumb, you're right"
"You're right, us splitting up is the right thing to do, I agree with you, this will never work out"
Stop defending yourself, don't say "I did this because this, this and that", you just say "you're right, I was wrong, I was dumb, I should have acted better, I should have been a better husband, that's why I totally agree with the way you feel now, I don't hold anything against you"
counter-intuitive and downright weird but highly effective and at the same time, you're upbeat, happy, life is good, your eyes are open, life will be good, even if she wants to leave and she will have nothing to fight against with an attitude like that - how could she, if that's what she wants and you're agreeing (without being wimp and sobbing horribly).
I agree. You just can't waiver here. No halfway about it.