“Was that wrong?”
Maybe, maybe not.
Was his life in perilous, imminent danger by remaining with his wife and children? If yes, was faking his death his only option to save his life?
If not, there is a cultural presumption that cheating in marriage is wrong. Yes, a lot of people do cheat but not to this extent - faking one’s death and leaving the country. Since you say you have worked in a lot of marriages, maybe this is very common to you then? I never knew anyone who took this type of approach or made such an effort to cheat on his/her spouse.
CC Guy is joking. It’s from a ‘Seinfeld’ skit when George gets caught making out with the cleaning lady at his office. ;)