Take it from a man who talks to much...
Don't say a word. Find some other way to deal with
your feelings, and in the mean time give this woman some distance
so that she can find time to work through her own feelins.
If she persist or becomes more aggressive, then you may have to
tell your wife, or risk having more of a problem.
Till then, stay the course... if you trully love your
spouse, don't blow it.