Home Princess Diana’s SISTER had relationship with Prince Charles but REFUSED to marry him Charles abruptly ended their secret relationship (Image GETTY)

Charles abruptly ended their secret relationship (Image GETTY)

Fast forward four years later to 1981, Diana became the Princess of Wales (Image GETTY)

Charles abruptly ended their secret relationship (Image GETTY)

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Charles’s secret tryst with Lady Sarah came during a ten-year dating spree (Image GETTY)

Charles dated Lady Sarah in 1977 (Image GETTY)

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