I also thought the LBS would be crazy to stay with the WAS.
I was the FIRST to say "I would soooo leave him if he did that to me". You can tell the people that have been affected by this, and those who haven't. The ones that haven't say "I canNOT believe you haven't packed his bags". The ones that have dealt with some type of infidelity say "Family is so important. Don't make any quick decisions. You need to do what you feel is right."