I am no expert.....other than been there done that. Like DBmod noted....by confronting them all you would have done is set a ball rolling that is unstoppable and the damage...unrepairable. Yes you are hurting, I can understand that...in the end though confronting the affair by showing up at the college would achieve nothing. In the end you would will horrible, anger your husband, give the OW ammunition in that you are crazy, and you would not stop the affair.
The affair is out of your control...completely...and trying to control something that is out of your control is a waste of your time.
I haven't read your stitch, but what are you doing for you? I like the beach visit, but what else?