I am glad to see that you're lining up some GAL activities and getting out of the house.
As for W 'telling' you that she isn't having an affair, it's par for the course...they all lie to your face. Again, again and AGAIN. Then they work with their affair partners to take the A deeper in the underground. Trust me, they're most probably talking about ways to cover up the A and strategizing ways to keep the wool over your eyes.
Just don't take W's words at face value, Rip. Continue to be vigilant for ANY sign of a probable ongoing, active A.