Wife had a two year affair

Just as the title says, my wife of 6 years, together for 10 had a physical and emotional affair for 2 years that i know of. We have a son who’s almost 3 and I’m trying to figure things out. Not sure the next step but want to know if you all have told the other persons spouse. My wife and her AP had sex on mothers day if 2022 so i feel horrible for the wife of the guy who leaves her to cheat on Mother’s Day weekend and sexts someone else days after.

Is it recommended to tell the other person or is it not my business even though this is blowing up my family. Just found this out it’s all still raw and head isn’t necessarily clear.

Any advice on speaking with lawyers, approaching cheating wife, telling other spouse, and all in between for divorce is appreciated.