"I was destroyed after her funeral. We were so close. We knew what each other was thinking. We had a special bond,” he said.
"I used to say to her, 'You'll see me out, you' and I got that wrong, didn't I?"
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Paul and Cilla were friends for nearly 20 years
Having previously suffering two heart attacks himself, Paul also admitted that while Cilla’s premature death had made him consider his own future, he won’t be slowing down any time soon.
"It does make you start to think a bit more about your own mortality. But I've no plans to retire. I'm 60 now but still enjoying it,” he said.
"And taking stock of your life is depressing - it dampens ambitions if you start thinking like that."
"Then all the jewellery would come off, and I'd have like a million pounds worth of jewellery in my pocket."
Cilla Black's Life In Pictures
Britain Cilla Black(01 of108)
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Liverpool born singer Cilla Black hugs the award that names her as Britain's Best Female Singer in a poll organised by a pop music newspaper, at the Cafe Royal in London, England on Feb. 13, 1970. (AP Photo/Robert Dear) (credit:ASSOCIATED PRESS)
Britain Princess Diana Cilla Black(02 of108)
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The Princess of Wales and Cilla Black pictured at the Ideal Home Exhibition in London, England on March 11, 1992. (AP Photo/Dave Caulkin/Pool) (credit:ASSOCIATED PRESS)
British pop singer Cilla Black and husband Bobby Willis, her personal manager, after their wedding at Marylebone Registry Office in London, England on Jan. 25, 1969. The couple have known each other for six years. (AP Photo/Leslie Priest) (credit:ASSOCIATED PRESS)
London Cilla Black Weds(05 of108)
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British pop singer Cilla Black with her personal manager, Bobby Willis, after they were married in Marylebone Registery Office, London, on Jan. 25, 1969. (AP Photo/Staff/Priest) (credit:ASSOCIATED PRESS)
London Cilla Black(06 of108)
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British pop singer Cilla Balck with her fiance Bobby Willis, in Mayfair, London, on Jan. 4, 1969. (AP Photo) (credit:ASSOCIATED PRESS)
Britain Cilla Black(07 of108)
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British Pop singer Cilla Black holds a Christmas present from beneath her Personality Christmas Tree at an exhibition of similar trees for different entertainment stars at Harrods department store in London, England on Dec. 16, 1968. Cilla designed the tree herself to reflect the record industry. (AP Photo/Robert Rider-Rider) (credit:ASSOCIATED PRESS)
Britain Cilla Black Cliff Richard(08 of108)
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Pop singers Cilla Black and Cliff Richard throw postcards into the air as they take a break from counting votes for Britain's Song For Europe at Kensington House in Shepherd's Bush, London on March 8, 1968. Television viewers were asked to choose the song to represent Britain in the Eurovision Song Contest after Cliff had sung the six possibilities on Cilla's show earlier this week. Cliff will sing the winning song again on Cilla's show before singing it at the Royal Albert Hall on April 6th, when he bids to win the trophy won last year by Sandie Shaw with Puppets on a String. (AP Photo/Worth) (credit:ASSOCIATED PRESS)
Britain Obit Cilla Black(09 of108)
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FILE - In this March 8, 1968 file photo, singer Cilla Black counts votes with singer Cliff Richard for Britain's "Song For Europe", in Shepherd's Bush, London. Spanish police said Sunday that the singer, who had a home in Estepona, southern Spain, died Saturday, Aug. 1, 2015. Born Priscilla White, Black worked as a teenager in the cloakroom of Liverpoolâs Cavern Club, where her musical talent was spotted by The Beatles. (AP Photo, File) (credit:ASSOCIATED PRESS)
Cliff Richard with Cilla Black(10 of108)
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Pop singer Cilla Black and singer Cliff Richard throw up votes which they are counting for Britain's "Song For Europe", in Shepherd's Bush, London, England, March 8, 1968. (AP Photo) (credit:ASSOCIATED PRESS)