Good to see you posting again!! Did you get a response back yet from the email you sent him? I don't think catching him off guard is really going to happen with an email though. You usually catch people off guard when you are face to face with them. He is away from you when he reads this email and can develop the answer he wants to give you, or that he thinks you may want to hear. He has no real true motivation for telling you he is cheating (if in fact he is - maybe he is not). What would be the result for him, you might no longer be available when he "needs" you. If you want to get a truer reaction you have to have these discussions in person, and I do understand how difficult that is. You did make a big step forward in just sending the email broaching the subject.
I have felt for quite some time that Mr. A is cake eating. I hope that I am wrong because you absolutely deserve his full and undivided attention.
