If you don't see the difference between leaving your family for another woman, and changing jobs because of an awkward personal situation, you're stupider than I assumed you were. Let me break it down for you:

Your scenario: you're making money, but are unhappy being around someone whom you're interested in, but you can't act on it (actually, you can if you both are discreet, but let's assume you can't).
My scenario: you're still making money at another job, and have an increased chance in getting what you want in your personal life.

PS - it seems really bizarre to equate a job with marriage, but perhaps you're married to your work. In which case, you shouldn't be with any woman Why should job and career always come first, before personal considerations?
PPS - none of this prohibits Mr. Frosty from asking the lady to have lunch or drinks with him. It happens all the time, and won't even be worthy of comment since a guy isn't typically interested in a lady who's 15 years older.