@Bestrong1976,
Unless I missed this, I don't see where you explored with your with wife what made her horny in her affair. Why not try to get her to explore what thoughts were in her mind or turned her on about the affair? If you do this, you will likely be surprised that it's nothing to do with the other the other guys looks.
You are still making the same mistake that I did for many years, it seems. You are assuming women get turned on similar to how men get turned on by physical attraction. For women they mostly get hot and really attracted by emotional factors. For example, most women agree that men are WAY sexier in a suit than when naked. To us guys that makes zero sense because for us..more skin of hot girl we see the more hot she seems. That's why for professional dancers, the men are always in suits while women are half-naked.
My advice is get inside her head. Learn what ...what turns her on.
NOTE: Find out how her and the other guy communicated. Was it by texts? Women get way hotter by sexy words in writing like texts and emails. Do you ever text her romantic or flirty things? Do you email her?
NOTE2: Please dont ask to read or the content of texts between them. Why not? well you might be tempted to imitate what he said or did. Girls love originality. So just try texting her stuff.
One last tip. Girls love guys with confidence and many girls get turned on by a guy who does not CARE if she is turned on or not. Ha ha. I have seen this time and again. Some girls and maybe your wife will perceive you a week or even girlish to care so much if she is attracted to you or hot. Many girls fantasize about being a guys little sex toy a play thing to do whatever he wants with her without regard for her desires.
My wife was never attracted to me for almost 20 years. Finally I figure this out and she still "claims" that she doesnt' really feel any attraction but she gets up early (never did that before) to ask me how she can please me before I head off to work each morning--every morning.
She is often now flirting with me....flashing her boobs at me..and other seductive things. She likes to spark me to take her and do what a I please with her.
Wife cannot get enough as soon as I stopped caring if she is attracted to me or not. She still claims she doesn't need or desire sex. But 90% of the time she initiates it now and 50% of the time I dont feel like it or busy with other stuff and she waggle boobs in my face or stroking my package till I cannot resist.
I want to suggest to experiment with this kind of attitude. NOTE: Avoid telling he you dont care if she is attracted or turned on. Just stop mentioning it or worrying about it and few her as you play toy. Watch her BLOSSOM.
Most girls deep down enjoy the idea of being a sex toy--but a clever and intelligent sex toy.