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What about this man's loyalty to his wife? Beyond his vows to remain faithful, if he were to divulge to a woman to whom he is attracted that he is unhappy, unfulfilled, uninspired by his wife - simply to "explore" such feelings - he is really insulting and dishonoring his wife, and disregarding the privacy of their marriage. Discussing such things with a close friend just to get them off your chest is one thing; spilling all to a woman you "love" is completely different. If you are willing to tell all to another woman, but not to your wife, your loyalty is misplaced.
If, as you say, you can't imagine ever leaving your wife, then start telling yourself, "I will never be with this woman" until you actually believe it. Until you see the fruitlessness of this discussion. You need to stop socializing with this woman beyond what is necessary at work, and start spending time thinking about the woman you married.