The Love Island star, 22, decided enough was enough after a series of rows and ended it, leaving Jack heartbroken.
He knew things weren't going well but was convinced they could make it work.
A source told Sun Online: "Dani may have said this was a mutual decision, but that's not the case. She ended it.
"He felt they could have made it work, but she showed a hard side and called time on the relationship."
Dani called it quits with the pen salesman just four months after leaving the Love Island villa, saying it wasn't meant to be long term.
Dani released a statement on Instagram last night, shortly after The Sun Online broke the story.
She wrote: "Jack and I have sadly decided to part ways. It's been an incredible six months and we will always have a place in our hearts for each other, but we've sadly come to the realisation that it's not meant to be long term.
"We both plan to stay friends. I hope you'll all understand. Love Dani x."
A source exclusively told us how the demands of life after the villa made it difficult for the pair to go on.
The insider said: "When they left the villa they really thought they would stay together forever, but reality soon set in and things started to get strained.
"They came out to a whirlwind of publicity and after a while things started to get to them and the cracks appeared.
"They are both incredibly busy and they have decided to call time on their romance."
Awkwardly, the pair's announcement comes the same day as a new trailer for Love Island's Christmas Reunion in which they play the happy couple sharing presents and dancing.
Throughout their four-month relationship, Jack and Dani insisted they would be together for ever, despite reports of arguments behind the scenes.
Shortly after they moved in together in September, Dani hinted that domestic life wasn't as blissful as Love Island fans might have hoped.
She told OK! Magazine: "Jack and I are only human and we're not going to always agree on everything, but we love each other very much and always respect and support each other through everything.”
Dani even insisted she wanted to wed by the time she was 25, prompting Jack to joke he was working to a deadline.
The actress told the Standard: “I have just always wanted to get married at 25. It’s a lovely age, because then you can have children after. Have a few years and then have children.”
The shock news comes at an almost identical stage of the relationship as the previous year's winner's Kem Cetinay and Amber Davies.
Kember lasted 132 days before going their separate ways on December 4 2017.
Just weeks ago The Sun exclusively revealed how Jack and Dani were feeling the strain following a series of rows.
The former couple have filmed their own reality show, and Jack admitted things were far from rosy behind the scenes.
However, he insisted that it was nothing they wouldn't be able to work through.
He said: "Filming the show wasn’t easy. It was tough, it was intense – you’re on camera most days of the week all day long.
“We had bickers during filming just like any other couple. I got emotional with Dani doing it; I even had a couple of tear ups. But Dani and I got through it.”
Awkwardly, Dani announced the release of her autobiography yesterday.
It will detail her life before the show, while also filling fans in on everything that's happened since she met Jack in the villa.
Announcing the news on social media, Dani shared a snap of herself proudly holding the finished product, titled What Would Dani Do?
She enthused: "So excited for you all to read my book in April. I never thought in a million years I would do my own book."
"I am so excited to put my feelings and words on to a bit of paper and just be myself.
"I have opened up on life before Love Island, rejection, heartache, and things that have made me who I am today!"
Making no mention of the failed romance, Dani added her new book will be jam-packed with advice for fans who need it.
"A lot of you sent in situations and have been answered in my book. It is available to pre-order, release date is 04/04/2019!!
"Can't wait for you all to read. I've spoken about life before Love Island, life now."
During her time on Love Island, Dani was praised for her level-headed attitude in the villa and was often the go-to girl when the other Islanders were having relationship woes.
The daughter of EastEnders' Danny Dyer has been inundated with job offers since winning the programme and recently secured her own reality show.
She's also a regular on Capital FM's Breakfast Show and has her own clothing range with popular online retailer In The Style.
Jack and Dani became early favourites for the Love Island crown after hitting it off on day one.
They cruised to victory, with neither tempted by any other singletons for the eight-week duration of the show.
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