three's a crowd

Idioms  

1. Also, two's company, three's a crowd. A third person spoils the ideal combination of a couple, as in No, I won't join you—three's a crowd. This expression, alluding to a third person spoiling the privacy of a pair of lovers, was already a proverb in 1546. For a synonym, see fifth wheel.

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Example Sentences

Three’s a Crowd: Why is the burden on your ex to “show our kids we can still be friends”? Why can’t you model maturity, by accepting his new relationship?

From Washington Post

In 2015, state procurement of drugs for hospitals and state-funded clinics, which account for up to 80% of Russia’s pharmaceutical market, became subject to the “three’s a crowd” rule, which excluded foreign businesses if at least two Russian companies were bidding for a contract.

From Seattle Times

Two’s company and three’s a crowd — but not for filmmaker Taika Waititi, singer Rita Ora and actor Tessa Thompson.

From Los Angeles Times

Three’s a crowd plus one: The biggest crowd ever, period!

From Washington Post

Two’s company but three’s a crowd in the thriller “Stalked by My Husband’s Ex.”

From Los Angeles Times