[*]DO NOT SNOOP! Keyloggers....checking her e-mail...will do NO good and LOTS OF HARM! Trust me...most of us tried it and it burned us! Anything you learn is useless if you want to restore your marriage.
I disagree in some very specific instances. I think verifying what's going on is good initially, so you know what you're dealing with, and it's also needed as part of a full transparency plan later on in order to verify the promised no-contact. But he ALREADY knows she's wayward, and she's running hell-bent from him and hasn't promised him ANYTHING at this point, so I'd agree that snooping is only going to mess with his head and take him off his game.