PUP- I tried that b/c it seemed to work for you, and she didn't budge- the last time I told her there would not be a friendship, I was met w/ "but I thought you wanted me in your life."
It's not a speech you give, that you get a positive response to. It's a stance you take, and a position you live out in front of them, while they're going thru their stuff.
In time, she will see that you're serious. My wife responded not to my STATEMENT, but rather to how I LIVED IT OUT IN FRONT OF HER, on a day-to-day basis, during her affair.