could also mean a number of things. He finds her attractive, he may just not be able to differentiate the difference between love and lust (don't know what his age is, though people of all ages can have problems with this one). He may be looking for a way out of his marriage, and his focus becomes someone else. Perhaps the marriage has become stale, and neither side is doing anything about it (or even acknowledging it). He may be the personality type that wants what he cannot have; it's obviously unrequited. The OP notes that he loves his wife - but in what way? As a romantic partner/wife, lover, friend, sister...
If someone is self aware, it could precipitate some soul searching. He's troubling himself by not letting it go. Attraction is attraction, falling for a person or object doesn't mean you have to possess it.
Anyone who's been burned by the irresistible attraction thang usually learns a lesson. Usually. 
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