I believe you are on the right track. Yes I did the assume the responsibility/resentment thing.
I too was full of the jealousy you speak of although it was 2 years ago for me. (right at this same time).
You will find you let go of everything to some degree. Although here is sonething I will share, I have been accused of not letting go (wierd I was thinking about that and my response to it before I read what you wrote), and my response was to put it on him. If he felt like I hadn't let go, I was sorry but I had. Then a few months later, I seem to have let go too much. He can't handle/understand why I don't want him talking to me etc...MLC madness at it's best.
I read somewhere that it can take us lifetimes to heal or 5 minutes. It is up to us. And yes the butterfly effect is a wonderful thing.
"Acceptance doesn't mean resignation. It means understanding that something is what it is and there's got to be a way through it."--Michael J. Fox