I also understand you can try the bluff- figure out as much as you can...new clothes, new parfume, new undies (sexy), grooming habbits, change in hours, long errands,- they also say women have a glow about them in an A of some type- heck you prob notice a huge change in her confidence, distance, etc...
Then you can just say, I know what's happening here, you're not fooling anyone.
I'd consult Pup and Allen to see if that's worth a try...