I am not sure what you are gaining by putting the A on the table? The M sounds over regardless...IMO you are just going to bring up something where she is going to feel blamed and angry that you are snooping. As far as she is concerned she probably thinks she has legitimate reasons for the A. No doubt it might make you feel better to fire a few shells at her but what does it gain you...It can only make the divorce process more difficult and her less cooperative if she is feeling attacked.
IMO opinion better off playing nice for now and trying to divorce as amicably as possible...once all that is done you can let her have it with no recourse.
Just my opinion...
"Friendship is like peeing your pants: everyone can see it, but only you can feel the true warmth."