I know the wise thing to do would be to walk away..
I could never slander your name or waste time hatching a plan to repay you for what you've done to me. I don't believe in 'tit for tat.' You should know better than anyone that this heart was not built to hate. That this soul can spare no room to harbor hate. This however, is my final resolution. I have decided to exist without you and in spite of you.
Many days from now you will remember me and when you think to call or when you pass me on the street, you will see and know that I did not fall apart like you hoped I would. In me, you will see the same light that you've always seen. And in doing so, you will understand that I am so much more than my scars.
I am the conduit; the medium. I am the means by which some great love, one that transcends everything that I am or wish to be, is translated into a language that you can comprehend. I will regard you, as I always have with only the purest form of love; a love that you were unable or unwilling to reciprocate to me. And the force of my love will break you in a way that my loyalty never could. I will be satisfied when my insistence on remaining whole even after you crushed me, has changed you completely.
There could be no sweeter revenge than that.