Wow, I don't know if I can give much encouragement since my situation is not at all similar. Just know that you have been heard, and have my deepest sympathy.
I would suspect that your wife's recent withdrawal and bitterness is that she is having to realize how horrible she has been to you, and how much damage she did. I believe that when the person having an affair breaks it off, they still go into a period of mourning. Even though they have made the decision to come back to their spouse, they are still mourning the feelings of 'high' they used to have with the affair partner. Now all she can see is a long and uphill road working on what she destroyed. Have you read the Divorce Busting section on Affairs? It may really help you and her in trying to deal with everything. Good luck, I hope everything works out. tut mir leid!
Me - 38 Husband - 40 MLC! Together 12 years Married 11 years Still the love of my life Forever only lasted 10 years before his MLC and affair