Conquered masturbation, but killed my sex drive, even for my wife. What do I do?

For years now I've been slowly winning the battle against masturbation and pornography. I'd slip up, repent, go a while, slip up again, etc. Eventually I was going months between slip ups. Early this year I finally managed to completely stop. Thank God. At last I quit.

However, something else happened. It's as if in giving up masturbation and pornography, I completely shut down my sex drive. My wife and I used to have a regular and healthy sex life. I desired her, and she me. I still love her and want to be with her, but now... I don't know. I just don't desire sex. She asks me "what's wrong" often, and tell her i dont know, and explain this situation (she is aware of my lengthy struggle). 1) Why has this happened? Any theory is welcome, and 2) What do I do about it?