1. Affair or not, 1800 texts in one month is at least *questionable*.
2. People of strong faith fall down this particular rabbit hole ALL the TIME. Your wife would not be unique in that.
3. Cognitive dissonance dictates that if she desires to be with him, regardless of her actual actions (PA, EA, or merely her heart leaning in that direction), her brain is going to make YOU look like dog chow by comparison no matter how well you DB. That is why it is *imperative* to know *accurately* what you're dealing with in that department. If for no other reason, so you don't beat yourself bloody when you don't "succeed".
4. All considerations of affair/not affair aside .... the million dollar question is: Do you want your wife to be with you out of pity and/or guilt based on how pathetic you seem without her? Once you've answered that, you know the answer to your questions about displaying PMA, etc.
"Show me a completely smooth operation and I'll show you someone who's covering mistakes. Real boats rock." -- Frank Herbert