It is believed Brook ended the relationship in March after reevaluating her life following her father’s death last year.
Brook, 28, appeared in public without her engagement ring for the first time at Sunday night’s BAFTA TV awards.
“The split is completely amicable and the decision was made after long conversations here and in the U.S. They remain good friends.”
The couple had planned to wed in a romantic ceremony at their 600-year-old farmhouse in Kent, England.
A spokesman for Brook has confirmed the split.
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