Kelly, IMO the only difference between an EA and a PA is that they aren't bumping bodies yet.
They are equally huge betrayals in a marriage.
Essentially the spouse having the EA/PA is saying "I'm not getting some need met in my M" and it's easier for me to go get that need met outside of the M rather than working out what is missing in the M with the other spouse.
And that's the real kick in the guts for the LBS, that the WAS isn't prepared to do what it takes within the M.
It's really a copout and a lazy option in my opinion.
H: 44 W: 42 Married: 23 years Bomb: 16/07/2009 PA Confirmed: 16/01/2010 Over it & working on ME: Feb'ish 2010