PMA_Baby, I've already been down that road. This time there is no need to make some grand statement about "being done". I'll just lay out my boundary, and if she chooses to date others, I won't be available to her. I might even do the gucci thing, and say "I'm sure we'll still see each other once in a while", but then never be available to her.
I admit I am wondering what her reaction to my text was. No response as of yet.