Happy to hear you decided no on the polygraph and I think for the right reasons. It seemed like you were going to do it when you talked about logic vs. feelings and seemed to be saying the polygraph made sense logically but your feeling was not to do it. To me it made sense more emotionally as some concrete step to get some kind of answer, but not logically since it's not really lasting reassurance like you want..
I had same "friend zone taps" experience, I think around my wife's birthday. Didn't say anything but I've been around enough women to know that's a kind of nervous defensive thing.
M 44, W 32 T 10, M 8 D 2 Oct '18: Fantasy affair with OW1 (yes, W) Feb '19: Inseparable from new lesbian BFF Still live together but a lot of tension