I think your letter was honest and touching. I don't think it was a bad idea to express yourself in this way to your W but I hope you realize that you may not get the response that you would naturally desire. SoulMechanic (past poster) sent a similar letter to his wife when he was first on the BB and, heartbreakingly, got no response whatsoever from his W. Unfortunately, in order to get closer to your W, the best solution might not be to bare your soul in this manner. She might just take it as another way in which you are invading her space or asking more of her than she feels capable of giving. It's quite possible that you would be better served by backing off, not just physically, but emotionally from the relationship at this time in order to get some balance in the relationship. If you can't become LD for sex, you have to become as LD for the relationship as she is LD for sex before she is going to feel any motivation or space to move towards you. Unfortunately, though I believe that it is absolutely necessary for you to do this for the sake of your own happiness, you may find that your W prefers a relationship that is balanced at a very cool distance, but at that point you will be better able to make decisions that will best serve your needs.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver