I'm sorry this is so hard for you. You don't deserve this hand, but it is, nevertheless, the hand that you've been dealt.
I'd suggest you treat your wife like you would treat a business partner or a casual friend or co-worker. Be civil; courteous. Answer direct questions, but don't look for her to meet ANY of your emotional needs, and for god's sakes, don't meet hers.
"EXPECT nothing; GIVE nothing" is how it was taught to me, and that served me well.
For a closing, maybe you could go with "In every situation, no matter how difficult, I will strive to do the right thing. I was not put on this Earth to please my wife, or to please man, but to please God, and in every situation, I will look to do what HE would have me do, with courage and grace."
