I say ignore the letter he was writing. How many times have I written a letter to H and then later regreted sending it? Or kept a draft and realized later it didn't matter enough anymore. I have one in my saved emails right now. I wrote it because it told him something so important to me. Two days later, I remember it and find that it just isn't so important to me anymore. I'm glad I didn't send it.
He sounds confused. Draw him in. Be mysterious. Keep making plans, validate, and make him feel good about himself. Compliment him, even better, compliment him to other people where he can hear you doing it. Don't let his vacilating back and forth bother you at all. He is bound to have "feelings of the moment." What's most important is that he is still there so you can do your best DBing. And maybe he never will feel like moving out.
Stop snooping, and create an environment of openness and honesty and validation where he can feel comfortable coming to you about anything. Be his best friend, and be sexy. Let him see you as the beautiful woman you can be - draw him back in so he will want to stay.
