Bright -I think they are angry with themselves, and that they blame us for how they feel. I don't know this, but this is how it seems.
You did nothing wrong. Relationships are messy and difficult, and MLCers want something they do not have to put effort into, anything that requires they look at their behaviour.
My xh is still angry with me, and actually has to manufacture situations to get angry about. After the divorce and long separation it is hard to find current excuses. I believe he is angry with himself, but cannot look inward.
So please stop taking the blame for something you didn't do. It is pointless, and it doesn't help anyone. Heal, and live your life. Easier said than done, I know, but possible.