Taking to Instagram, Dani said: "Jack and I have sadly made a decision to part ways".
Dyer confirmed the pair's split in a message posted to her Instagram story, in which she said they had realised their relationship was "not meant to be long term".
Dani continued in her statement: 'We both plan to stay friends.
Both Love Island UK and Love Island AU will return in 2019. I hope you'll all understand.
According to The Sun, the reality stars, who moved in together following their big television win, have been drawn apart by their hectic schedules.
Meanwhile, a source added: "They came out to a whirlwind of publicity and after a while, things started to get to them and the cracks appeared".
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It's all over for Jack and Dani.
The couple's split comes after an awkwardly timed Love Island: The Christmas Reunion trailer dropped during I'm A Celebrity's advert break.
In the 15-second video it sees Jack and Dani exchanging festive presents, as well as dancing with each other.
The Love Island winners had also been filming their own reality TV show, which was scheduled to be broadcast soon.
In fact, only three of the couples remain together - Josh Denzel and Kaz Crossley, Megan Barton-Hanson and Wes Nelson and Adam Collard and Zara McDermott.
Jack is yet to comment on the announcement.