I'm divorced now so it didn't help in the sense of "saving my marriage", but it did give me a much better understanding of the mindset and quite frankly what she wrote closely lined up with what my W thought and said behind my back (even if that was hard for me to comprehend).
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21