The rugby player confirmed tabloid reports he and Amber had parted ways during as appearance on Ireland’s Late Late Show on Friday night.
Amber was due to appear alongside Greg but failed to show, forcing him to speak out on the rumours about their relationship.
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Greg has confirmed he's split from Amber
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He insisted claims he had broken up with Amber via text message – just 39 days after winning £50,000 on the ITV2 reality show – were inaccurate.
He said: “First off, the age-old saying, don’t believe everything you read. I’ll be open and honest.
“Me and Amber have been chatting the last couple of days, over phone calls – this whole thing about a text just isn’t true. People just want to sell stories.
“We’re mad about each other. I’m mad about her. What’s not to be mad about? Gorgeous, smart, funny personality. The queen of Love Island for a reason.
“But, you need to be realistic about the situation. She lives in the UK. Every brand wants to work with her, every event wants her there. Of course, she deserves all of it.”
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Amber and Greg only won the show 39 days ago
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Greg, 24, said he decided to return to his native Ireland to focus on rugby.
He said: “I decided to come back to Ireland and do my thing here. I’m trying to get to the Olympics with the sevens team, I have my law exams coming up. We’re both so jam-packed busy.
“And you need to take these opportunities by the scruff of the neck.”
However, Greg faced criticism from Amber’s best friend on Twitter.
Mart Tweedy, who ran Amber’s social accounts while she was in the villa, tweeted after his TV appearance: “Like, Greg took that £25k bag and RAN at the first opportunity he could - he pulled the wool over EVERYBODY’s eyes. He would be NOBODY without @AmberRoseGill
“The night of the final, he had 110k followers, she had 1.9mil. I had to canvas votes SUPER hard to make up for his side.”
Greg and Amber are not the first Love Island winners to split up shortly after being crowned. The 2018 winners, Dani Dyer and Jack Fincham, went their separate ways eight months after leaving the island.
Jess Hayes and Max Morley won the 2015 edition of the show and split up six weeks later, while 2017 winners Amber Davies and Kem Cetinay lasted five months before calling it a day.
However 2016 champs Cara De La Hoyde and Nathan Massey are now married and have a son together.
Celebs Who Handled Their Splits Like A Boss
Cameron Diaz and Justin Timberlake(01 of11)
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Let's be honest, break-ups can be messy, particularly in the glare of the spotlight, so it's good to see when two celebrities can put their differences aside and still be friends, as Cameron and Justin did - even eventually going on to star in 'Bad Teacher' together. (credit:Jim Spellman via Getty Images)
Harry Styles(02 of11)
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No one is exactly sure what happened between Taylor Swift and Harry Styles, but even after she appeared to mock him during an awards show performance, he's had nothing but good things to say about her and her music in the press.
Whether he's genuinely happy for her, or he's simply killing her with kindness is unclear, but either way, we could all learn a thing or two from Hazza. (credit:Kevin Mazur via Getty Images)
Jennifer Aniston(03 of11)
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And speaking of how to flawlessly handle a break-up... The media coverage surrounding Jennifer Aniston for the decade after her split from Brad Pitt, was often unnecessary, cruel and steeped in sexism.
Through it all, though, she kept her head high, continued working and, more importantly, smiling away, despite what was said about her in the press.
Now she's one of the highest-paid actresses in the world, and is married to her long-time partner, Justin Theroux. (credit:Steve Granitz via Getty Images)
Mariah Carey(04 of11)
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When she and the father of her two children, Nick Cannon, split, Mariah was determined not to give the press the dirt they were craving.
So much so, when approached by a TMZ reporter, Mimi said simply: "Oh, it's much too hot to talk."
Flawless. (credit:Ethan Miller via Getty Images)
Elin Nordegren(05 of11)
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Elin Nordegren - better known as the former Mrs Tiger Woods - is our personal break-up hero.
So, your husband has repeatedly cheated on you and the world's media are talking about it? Whatever.
Elin's attitude throughout the scandal was flawless: head down, sunglasses on ... and just wait for that divorce settlement to roll in. Props to you, Elin. (credit:Orlando Sentinel via Getty Images)
Katy Perry(06 of11)
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However, sometimes it's difficult to pretend you're anything other than hurt. And do you know what? That's OK too.
In showing her vulnerable side in her documentary film, 'Part Of Me', Katy undoubtedly assured a lot of people that it's not about how hard you fall, it's how you get back up again. (credit:JB Lacroix via Getty Images)
Gwyneth Paltrow(07 of11)
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Gwyneth Paltrow hasn't had a bad word to say about Chris Martin ever since they "consciously uncoupled" in 2014, and even spoke favourably about his relationship with Jennifer Lawrence.
Instead, she focused on her own career, her family and friends, and the continuing growth of her site, Goop. Now that's how you tackle a break-up like a boss. (credit:Sonia Moskowitz via Getty Images)
Katie Price(08 of11)
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Perhaps not quite to this extent, but sometimes a night out with your friends can be just the thing to get you through a break-up, as Katie Price proved when she flew to Ibiza, shortly after splitting up from Peter Andre. (credit:Dave Wood via Getty Images)
Jennifer Lopez(09 of11)
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Determined not to let anyone paint her as a victim, J-Lo bounced back from her split with Marc Anthony by getting together with a far younger man.
Nice one, Jen. (credit:Gregg DeGuire via Getty Images)
Perrie Edwards(10 of11)
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Similarly, the world of entertainment journalism seemed determined to paint Perrie Edwards as a victim when she broke up with ex-fiancé Zayn Malik, particularly when he quickly got together with Gigi Hadid.
How did she respond to that? With independence anthem 'Shout Out To My Ex', which quickly topped the UK singles chart, and bagged Little Mix their first ever Brit Award. (credit:Karwai Tang via Getty Images)
Adele(11 of11)
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And then, of course, there's Adele, who managed to turn her disastrous break-up to her advantage and bag herself a wheelbarrow of Grammys, which we have all the admiration in the world for.
What was it Beyoncé said about 'lemons' and 'lemonade' again..? (credit:Steve Granitz via Getty Images)