Silent and Cruel wife

I have been married for about 10 years now to my wife. She has abandoned me entirely emotionally and sexually. I have been very good to her and given her all that I could throughout the time I've known her. About two and a half years ago, she shut down entirely and we haven't had sex since. I have tried to talk to her and reason with her through long letters, e-mails, etc. and even though she has STOPPED entirely, I still continued to be a husband to her since this is what I pledged on our wedding day and I am a man of my word. I have pampered her with gifts, make each occassion as big and as wonderful as I can, etc. But each time I have tried to talk to my wife, she becomes mute and will not say a word. So last night, after saying a few things, I though I would do the same thing and see how long she would last with me being mute as well. I sat there for almost an hour and she said nothing. As soon as I got up, she went straight to bed without one single word. Have any of you ever had a wife or husband do you this way and what is your advice for me. I am becoming more and more depressed and I have done everything I know to do to be her husband and woo her back but she simply refuses to hear me.

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