Mighty - you are so right on the lack of closure. And the ones that periodically 'try' (used in the very loosest sense) to come back actually contribute to the problems we face.
These 'touch and goes' are painful and disruptive. We tend to believe them because our former partners seem normal when they say those things - and frankly we often want to hear them.
And UR is right - acceptance is the golden ring. Being who we want to be.
On a lighter note I was hit on twice in the last week (not just my imagination) by guys 20 years younger than me!! It made me laugh all the way home!