GF...I think you already answered your own question.
Quote: 1) Whichever OW is doing this, this is just really a reflection on who they are as a human being...what kind of person would do this?
2) And this is the big one -- if it were to turn out to be true, that SO had a PA while we were together before, I honestly don't think I would care. And here's why -- it's not a reflection on me. It only makes a statement about who he is, or at least was, back then.
However, I honestly don't believe it's true. Either way, it's irrelevant.
Why give ex -OW your time, energy, and focus??!! You have the man in your arms and he wants to spend the rest of his life with you. Ignore those stupid, juvenile emails!