"I don't want to sound like a chump, but I really want to believe what my W is telling me."
You're not a chump hon, I've done the exact same thing for years.
It's a hard thing to accept your spouse is being unfaithful (oh-my-gosh is that an understatement), but it's likely something you have to accept, because whether PA or EA, she is most definitely not behaving as a faithful spouse.
It sounds like you have the tools and are already working on what you're doing. Keep working on YOU--the confidence is key.
Good luck. You're on the right track. We're here for you.