Idk why some folks are ITT talking about making bread on the side or hiding stashes away from your spouse when that's not what financial infidelity even is.
"Cheating" in this sense is basically spending large amounts of money behind your partner's back and/or racking up huge debts without the other party knowing. There's no "side hustle" or "secret overtime" involved here.
Didn't we have a nikka on here like a month ago who blew his family's rent money on a stock bet he thought was a "sure thing"? That's the kind of "financial cheating" the article is talking about here.
I have so many stories like this from people I know IRL it's not even funny. And just anecdotally, the collective "guilt" is split pretty evenly. From bytches secretly applying for store cards and proceeding to "retail therapy" themselves into oblivion, to dudes dipping into savings accounts meant for homebuying in order to covertly purchase video games and trips to the strip club.