Damn dude, what a shitty friend and a shitty wife I'm sorry to hear about that.

People really have no sense of morals anymore.

I'm assuming you have kids and that's why you went back to your wife.

But now, you seemed to have developed a fetish for your wife sucking your best friends cock......

Honestly, this is probably because I'm a porn addict trying to quit porn, but I think you should do this when you get off your medicine: Fuck your wife and fucking punish her ass for cheating on you. You must make her submit. She must be 100% yours.

Ok, yeah that's the porn addict in me talking. Look man, I wish you the best but I have to say that you and your wife didn't exactly take in traditional maritial relations when you two started being sexual with other people (together, not when she cheated).

I don't know, I don't have any advice. Good luck to you brother. Stay strong. No porn. Maybe cut out the bad habits like having sexual relations with other people, even if it's together with your wife.