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Theory D: Kate Vetoed Cressida

Cressida's half-sister Isabella Anstruther-Gough-Calthorpe was once romantically linked to Prince William — apparently he had an unrequited crush on her back in the day. In 2007, other "sources" reported that Isabella was the one woman Kate "simply could not bear." Kate's role in the royal family is growing, so perhaps she used her influence to discourage Harry from pursuing the relationship with the sister of her former "rival."

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