You DO need to be reading up on self-improvement and even marital self-improvement books . . . but the marital ones are for future use, if and when your wife decides to end her affair and give you a 2nd shot at your marriage. NOT to be used to PURSUE her right now, or "show her that I've changed."
SUPPLICATION DOESN'T WORK in these things. She SAW the softer side of Sho for 6-7 weeks; now she needs to see that that man also has healthy limits and boundaries, and values himself enough to even possibly lose her over them if she doesn't end what she's doing.