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It's really very nice to see that so many of us agree - this is an example of Cary at his finest, and there's some good advice all around.
I can only add one thing to what's been said. "Closure" is an overrated and misused word. It doesn't imply "satisfaction", it just means finalization, taking that one last step. There's a grieving process for the end of anything, and the end of a long relationship justifies some grief. It doesn't require that the two parties ever acknowledge what went before, or shake hands and vow to be better friends after all that. Sometimes you just have to tell yourself you did the best you could with the hand you were dealt. It was a tough time, but it's over now, you've come out the other side without any serious injury, and you've got a new life to live.
Make a ceremony of your new life - walk out into the sunlight and give thanks for where you are.