The pair, who met at a tennis match over three years ago, are often spotted looking loved up at glamorous events together but according to a source close to the couple, the romance is now over - and it could be down to distance.
Pippa, the younger sister of Kate Middleton, is said to have ended the relationship due to the prospect of keeping the relationship going long-distance after Jackson, who is a stockbroker, relocated to Switzerland to work for a Geneva bank.
The source told US Weekly that the split was 'mostly due to geographical issues', saying: 'They were rarely together since his move [to Switzerland] and it just caused too much strain on their relationship. They still love and respect each other.'
Rumours of a break up began when Pippa, 32, was seen at this year's Wimbledon without her 37-year-old boyfriend, despite them sharing executive seats in the royal enclosure last year.
Pippa and her boyfriend Nico met three years ago at a tennis match, and are often spotted attending glamorous events together
Instead, Pippa went with her brother, James Middleton - who has just denied rumours that his own relationship with TV presenter Donna Air is over.
Pippa and Nico looked happily in love the last time they were spotted together, leaving the North London Arts Centre together last month, and there were even suggestions that an engagement was on the cards before Nico's move to Switzerland.
News of the split comes a few days after Pippa was spotted spending time with ex-boyfriends James Matthews, whom she dated back in 2012, and England cricketer and financier Alex Loudon - both of whom she remains good friends with.