All I know of with my wife's EA/PA is a EA but I strongly suspect a PA. It could have just been a ONS but it really doesn't matter one way or the other. But what I wonder is if the guilt of the action is what turns them into a WAS and in some cases WAM's (mom's) and WAD's (dad's). My wife lived for her children and they were constantly with her. Then she came home from a work related trip and no longer wanted to be a wife or a mom. On my long daily walks I try to figure these things out sometimes and although it has been nearly a year, It is actually getting clearer to me now that that is probably what made her flip out.
She could not handle facing me or her kids due to her guilt. She could not face her family or even friends. She just moved out and only associates a bit with work people (for all I know) and see's her kids maybe once a week, but that is getting stronger.
In the year I have grown and become a better person and a full time dad who loves my kids and they are the center of my life, but now she is starting to come peeking around again and trying to be friends. Funny how they do that only after we have gained the inner strength to stand on our own. Thank God she did not do it when I was weak. That would have been a disaster and only led to more pain for everyone.