The former British prime minister David Cameron has said he has been "hugely depressed" by the outcome of the Brexit vote there.
He told The UK Times he is "truly sorry" for the political turmoil it has unleashed, admitting his approach "failed".
Mr Cameron has also accused the current Prime Minister Boris Johnson and Conservative MP Michael Gove of behaving "appallingly" during the referendum campaign.
Mr Cameron gave the green light for the vote to take place in 2016.
Both Mr Johnson and Mr Gove were prominent figureheads for the 'Leave' campaign.
"Over the issue of whether or not we had a veto over Turkey [accession to the EU] and over the issue of the £350m on the bus, I think they left the truth at home," Mr Cameron said.
He also criticised Mr Johnson's recent behaviour in suspending the British parliament for five weeks - a move many critics say is a tactic to stop MPs interfering with his Brexit strategy.
Mr Cameron said: "Taking the whip from hard-working Conservative MPs and sharp practices using prorogation of parliament have rebounded.
"I didn't support either of those things. Neither do I think a no-deal Brexit is a good idea."
The 52-year-old admitted he has been "hugely depressed" by the outcome of the vote and that he is "truly sorry" for the political turmoil it has unleashed.
However in his new book, 'For The Record', Mr Cameron defended his decision to hold the vote.
"But on the central question of whether it was right to renegotiate Britain's relationship with the EU and give people the chance to have their say on it, my view remains that this was the right approach to take," Mr Cameron said.
"I believe that, particularly with the Eurozone crisis, the organisation was changing before our very eyes, and our already precarious place in it was becoming harder to sustain."
He admitted that some people will "never forgive him" for holding the vote, and said a second referendum cannot be ruled out "because we're stuck".
Mr Cameron also said he recognised "the uncertainty has been painful and difficult" since the referendum, adding that "it's been difficult for all sorts of people in all sorts of walks of life".
"Every single day I think about it, the referendum and the fact that we lost and the consequences and the things that could have been done differently, and I worry desperately about what is going to happen next."
Mr Cameron was asked whether he has trouble sleeping: "I worry about it a lot. I worry about it a lot," he replied.
He also revealed that the morning after losing the EU referendum he phoned Barack Obama and European leaders to tell them he was "sorry" for the outcome.
