As for reasons, I can only speculate, seeing as she won't admit it, but my educated guess is because I told OM in an email I had plenty of evidence that W was lying and we were still together... She was deleting the evidence that I might send to him... The ILYs and the pic of the pregnancy tester in particular I think.
I missed the episode of the pregnancy tester. May I just remind all H's who have a W that's been in an A (and/or still in an A), you are taking a risk by having sex with her. There have been cases right here on the board, where the W would suspect the possibility of pregnancy by OM, and she would have sex with her H........as coverage, should she need it.
I think you are gambling with your own health risk, having sex with your W........especially when you know OM is still in the picture (and why would you?). Until she has gone through the entire no contact; withdrawal & transparency; shows you results from her STD test........., and has at least one period after completely no contact with OM..................beware! Protect yourself, and don't be duped again.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!