When you don't care for sex anymore...

I've posted in the Sex in Marriage forum a number of times regarding my sex life, in that want a more adventurous sex life while my wife is decidedly more conservative in her tastes. Several months back, while we were playing a sexual board game-type game, my wife informed me that the game, which we had played several times in the past and I thought she enjoyed, was the "least arousing thing" she had ever done and told me she never wanted to play it again (this didn't evolve into a shouting much, just that she didn't like it or wanted to play it). My feeling were crushed. I always knew that she only tried things because I asked her to (when I've brought up the subject of fantasies before, her answer is always "my only fantasy is to be with you"). Now, I was always the LD in our relationship. She had a partial hysterectomy a few years back, and our sexual desire plateaued. But when she confessed to me what she did, my desire to be with her dropped through the floor. We have sex maybe twice a month, max. She always initiates it. I try to enjoy it as much as I can, but I haven't had an orgasm through intercourse in at least two months. In the past, I've tried to spice up things up through trying new things. I would get rebuffed most of the time, but I didn't take it personally, and I would still enjoy the sex we had. Now I'm not interested in trying anything new, much less vanilla sex on it's own, or even talking to my wife about it. Just not interested in having sex with her anymore. I know I'm in trouble. I've even caught myself eyeing other women in the gym. What do I do now?

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