Singer George Shelley has left the group Union J. 

The heartthrob has been part of the band since 2012, when they competed on 'The X Factor', but has now departed and remaining members, namely Josh Cuthbert, JJ Hamblett, and Jaymi Hamsley, told Britain's The Sun newspaper that he refused to make commitments after returning from the 'I'm A Celebrity' season he appeared on.

Josh Cuthbert said: "He did the jungle, he came off it and his head space was different to ours. Using a sporting analogy, he wanted to turn up to the big matches but not turn up to training." Jaymi Hamsley added: "It's heartbreaking. I spoke to him the other day and I said I'm heartbroken over this. He wasn't putting his full effort in. One member is not bigger than the band."

A spokesperson for Union J has hit out at these reports and told press that the decision for Shelley to leave the band was actually mutual:

"It was a mutual decision for George to leave Union J so he could focus on his broadcasting and acting career. The fact of the matter is that the other members of Union J are simply jealous he has achieved the start of an exciting new career and they have not. George had agreed to be totally magnanimous towards them, but unfortunately this has not been reciprocated."

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Watch footage of Shelley in the jungle below: