Should I resort to an affair or divorce my wife?

I don't love my wife anymore, but I don't want to get divorced because I have young children. I am not appreciated by her and she treats me very badly. She is a great mother but not a good wife. I have been married for 10 years and have never once cheated on her. However, I also havent been intimate with my wife in 8 months. I have needs just like everybody else and I dont want to ruin my kids life. What should I do? Affair....divorce.....any advice?