It seems you're referring to the phrase: (Tsuma ni damatte sokubaikai ni ikun ja nakatta) — roughly, "I shouldn't have gone to the sales event without telling my wife."
Not dramatically. Just say: “Hey, I went to the flea market last week without mentioning it. I realized that was dumb. Want to go together next time?” tsuma ni damatte sokubaikai ni ikun ja nakatta best
"This antique plate... it's beautiful."
