The former Take That singer, 49, looks wistful as he looks back to 2000 when he says he shares a "magical" time with the Spice Girl.
They enjoyed a lengthy holiday in the South of France with his songwriting partner Guy Chambers and his wife Emma.
Robbie says on camera it was the happiest he had been in a decade with only his paranoia stopping it potentially becoming a longer and more serious relationship.
Reflecting on it, Robbie says: "It was a very confusing relationship, because she's a girl and I'm a boy, we are very good friends trying to sort out the wreckage of the past.
"Our relationship starts when I am in AA. You are told not to get into a relationship in the first year and I get it, you can't even look after a cactus, let alone somebody else.
"I just found her company very very easy, there is a silliness. We really got on really well. It was fun.
And we were just a little gang that were sharing a very magical moment, in a magical place.
Footage shows Robbie and Geri cuddling up and joking around as well as wrestling on the grass and singing songs on-board a boat.
Asked by the documentary director Joe Pearlman if he is happy in the footage, Robbie replies "yes". When the narrator says for the first time in all the footage, Robbie adds: "Yes. In all of the footage."
At this point viewers have seen his career from 1990-2000, and after the trip Robbie was compelled to write No1 single Eternity about her.
Denne historien er fra November 04, 2023-utgaven av Daily Mirror UK.
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Denne historien er fra November 04, 2023-utgaven av Daily Mirror UK.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
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