Man, you people are terrible. Stop letting your insecurities run rampant when this guy is clearly looking to fix things with his wife. He's not asking for permission to cheat - he's explaining his damn feelings so we have some context to assist if possible.

OP: I don't think your feelings are wrong. You have a right to not be attacked for losing attraction to your wife. I do however feel like your wandering eye is probably the cause for your loss of attraction. I'm willing to bet money on the fact that you're allowing yourself to fantasize about other women and in turn projecting resentment (even if it's subconscious) onto your wife, resulting in you seeing her as just a family member and not a sexual partner. To reiterate, your feelings are 100% normal.

Everyone has the capacity to fantasize about something "more". My wife can fantasize about being with somebody who is wealthier than I, or feel attraction for a taller man than myself with broader shoulders and an interesting career and accent. That's fine. I also would encourage her to communicate with me on this matter so we could choose to resolve it amicably or go our separate ways if our wants and needs differ for too long. I know she'd sure as hell want me to address my feelings with her if I were in OP's position.

Keeping these kinds of feelings inside will only build resentment, tension, anger, and eventually total indifference. Nip it in the bud and get help if you value your marriage.

Fighting our instincts is insanely difficult and will often times end in unnecessary tension, resentment, and anger. Get a therapist and continue communicating with your wife. If you can't work it out where everyone ends up happy then divorce and move on.