While Starsky's advice os on the money, there's a couple of points you might want to bear in mind.
Yesterday is yesterday. It can't be changed. Today is more important. Secondly, be careful what you ask for. Ask yourself if you can stomach reading the communication between them. You sound in a better place emotionally than when I read my wife's exchanges, but it is still a stomach churning exercise.
She SEEMS like she wants to move forward. Which is good in itself, but you're right in wanting trust also.
I'm not sure if seeing evidence of past crimes is going to restore that. Give her benefit of the doubt, but insist that this is a last chance situation. One more piece of contact with the other person and you are done!
Suspected EA: Feb 2013 Bomb drop: Mid March 2013 Separation: Mid April 2013 (I fought for marriage) Filed for Divorce: April 2014 Accidental Exposure of affair: June 2014