Kate's Love for Prince William Trumps His Mistress' Care

Prince William's rumored affair with model Rose Hanbury has strained his marriage with Kate.

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Royal author Tom Quinn's book, "Golden Youth," reveals why Prince William has stayed with Kate.

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William's relationship with Diana was not stable due to her desperation for love.

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Kate represents a solidity that the late Queen represented - constant and never complaining.

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William, who is emotional and prone to losing his head, finds Kate's stability appealing.

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Kate helps William lead a peaceful life, something that no other woman could achieve.

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Kate offers something unique to William, which is why he has stayed with her.

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