I don't know your specific situation, or what your intentions are or what you've said to your wife, and I don't want this to sound like an attack, but I've read a fair few posts like this over the last few years. The truth is, your wife married a man, because she wanted to be with a man. This isn't passing judgement on what you are doing and Schotastic is right that you shouldn't feel guilty for wanting to live a life true to who you are, but you can't expect your wife to be happy about it. And you can't assume that she will want to stay with you if you fully transition.
I was in a long term relationship when I came out, we'd been together for ten years. I told her the truth and was clear about my intentions, and I said that I wanted to stay together. She didn't see a future for us because she isn't attracted to women and I respected that decision. We may not be together but she stuck by me as my best friend and has given me a huge amount of support.
I hope everything works out for you, but this will be a very difficult time for your wife.
