You spoke your peace with the OM, now leave it be. Anything further looks like WEAK PURSUIT, and actually DIMINISHES your power. You said what needed to be said, and you run the risk of treating anything he says as the TRUTH. At BEST, it will be self-saving SPIN, and at WORST it will be outright lies. Cheaters lie -- PERIOD.
As for your wife, I suggest you LET HER GO, and use this time to work on yourself.