Who knows, for all I know maybe it is already a PA and I've been a fool for months! (Again, I don't think so).
I just got proof of my W's PA after arguing for years about it, so take my comments with a grain of salt.
Looking back, the things that jump out at me:
- W always had a great excuse for everything - When W moved out for a week last summer, she said if I slept with anyone, she'd want to know, as that signal the end for her - W has always had high morals. I'm still blown away by someone who hates any shade of "stealing" would be ok with PA (son taking a shirt from lost and found = stealing to wife and she's really gotten animated about it) - W basically has a double life. She's the great mom and wife around us and the people in our life, but she's spending an enormous amount of time with OM - W got better and better at hiding affair
As for me, I wanted to believe her....every time. And so I did.
My point here is not to say your H is or isn't. But trust your gut feeling on it. If you think there is, there probably is. You don't do yourself any favors by convincing yourself otherwise.