Hi JCJ, I am glad you have stopped blaming yourself. An A is kind of like a double edged sword in some ways-yuck.
Actually very very few men waw without either being in an affair set up or someone waiting in the wings. Time and time again I have seen posters certain there is no one else, sadly only to be devastated again when they find out the truth.I guess some are better at hiding it and also we just don't want to see it.
Hope the meeting goes well, sometimes it helps to make a few notes of what you want to say, keeps you on track. Not to read from it but maybe keep in handbag and refer to in the ladies if you feel overwhelmed. I hope it goes as you want it to. Good luck.