The 26-year-old, who rose to fame after winning the fifth season of Love Island in 2019 alongside Amber Gill, made the confession as she shared a video to his Instagram account documenting his favourite memories from 2021.
His highlights included a trip to Paris, his Tokyo Olympics journey, a skiing holiday, and a golfing day out.
Greg reminded his followers to be aware that “people usually only show their best bits on social media” as he wished fans a happy new year.
Captioning the post, the Limerick native wrote: “Recapping my fav moments of 2021. Thanks so much for always supporting me, I appreciate you guys big time.
“Keeping it real with you, this year has given me the best times of my life so far, which I’m very grateful for, but it’s also given me my worst times.
“Just remember that people usually only show their best bits on social media and let’s hope 2022 is good to us all!”
In another post celebrating the new year, the former rugby 7s star said that people should put less pressure on themselves as we enter 2022.
“Happy new year my friends,” he wrote.
“I hope it’s a great one for you but just because it’s a new year doesn’t necessarily mean you have to reinvent yourself. There’s a lot of pressure around ‘new year, new me’ but sometimes what you’re doing already is good enough and you just gotta keep doing that.”
Fans and followers flocked to the comments section to thank Greg for being honest about his ups and downs throughout the year.
One commenter wrote: “Thanks for your honesty as always Greg! Said it before, but I just love the attitude you bring to it all! Wishing you a great 2022!”
Another said: “Rollercoaster ride 2021…… be proud for making it through the good and the bad days…. Makes it all that more worthwhile!! Always an Olympian that’s special…. Happy new year 2022.”
While a third chimed in: “I resonate so much with the caption…Hoping for great things in 2022.”