I took years and years of blame. She'd twist everything in a million ways to make sure I was always blamed, and the only way we could resolve fights was if I said I was sorry, even when I wasn't in the wrong. Yeah, not doing that again.
Just realize all that blame is bull
PLEASE READ, she doesn't decide what is your fault, you do. Some things probably are your fault, most probably aren't. She was too fragile and disingenuous to take responsibility for her actions, and so she blamed you.
You might feel beaten down by her, your self esteem low because of her treatment, then you become more dependent on her, and think she's more perfect than she is, and for that reason you might blame yourself more, to keep her "more perfect" in your eyes. Don't do it. Be honest with yourself about who was really to blame for each thing, and what was acceptable behavior on both your parts.