"Please understand that this is not about you wanting to date whomever. "
you're probably attempting to say, "i'm not trying to control you".
dont bother.
The previous paragraph seems almost like a good way to end it to me. Just maybe one final sentance or two along the lines of, "you are an adult... you control yourself, and your choices. My choice for me, is that I do not wish to continue our relationship as it currently stands. I wish to have a better one for me, with you.
My current status: june 2006. Wife ran out and filed D. Finalized Jan 11, 2010, after 12.5 years M. 3 wonderful sons caught in the middle