Why did Arthur tolerate Isabella's contempt?

He honored a promise to stay out of the family business.

What happens immediately after Arthur leaves?

A fleet of black cars arrives and influential figures kneel to him.

Cross the Rubicon

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Cross the Rubicon — A hidden mafia don endures years of mockery to keep a vow, then reveals his power after his wife divorces him for a richer man.

Arthur surrendered control of the underworld to honor a pledge, allowing his wife Isabella and her circle to treat him as worthless. She discards him for a wealthier suitor, certain he will collapse within days. Instead, Arthur serves divorce papers and vanishes. A motorcade of black sedans soon blocks the street, and the power brokers Isabella courted kneel before him, exposing the don she never recognized.

Quick answers

Why did Arthur tolerate Isabella's contempt?: He honored a promise to stay out of the family business.
What happens immediately after Arthur leaves?: A fleet of black cars arrives and influential figures kneel to him.