Hi kenva, our sitch's have similarities albeit mine is much more drama filled. I don't feel experienced enough to give advice here very often, but your question is pretty direct. You will never know what's going on in her head, and it is quite possible that if you could you would not want to know. This is termed mind reading and something you want to avoid for your own sanity, you can't read into her thoughts or actions. My W had an affair as well and trust me in that I know this from experience and it accomplishes nothing.
Follow the 37 rules, GAL and work on yourself, only time will tell how it is going to play out. Good luck to you my friend, we are in the same boat...
me 38 W 30 T 3 M in 05/2010 Separated 08/2011 Stephchildren (all hers) SS17, SS12, SD8 I filed 8/27, she countered I filed response 9/5 Anxiously waiting on the judge!