The star had to be comforted by his fellow coaches on Saturday night’s episode, after a performance from twins made him reflect on his relationship with brother, Ben.
The pair haven’t spoken since a big argument after Olly did not attend his wedding in 2009, as it clashed with one of the X Factor live shows, in which he was competing.
Opening up about the decade-long feud, Olly told co-stars Meghan Trainor, will.i.am and Tom Jones: “I feel like the next time I am going to see him is going to be at the worst place to see someone. It will be at someone’s [funeral] that we lose in the family. I don’t want that to be the case.
“It’s a shame, more so for my mum. You bring two people into the world. I do miss having my twin with me.
“We had this bond as a twin, it was something I was proud about and I still am. I’m a twin, quite a proud thing and that brings back memories.”
Olly then became emotional, with the other coaches rushing to comfort him.
“When we were kids we used to sing together all the time, we could have been singers together,” he said.
Olly tweeted during the show that the moment was “tough to watch back”.
The singer has spoken many times in the past about his desire to heal the rift with Ben.
In 2017, Olly described how not speaking to his twin was the “hardest thing in his life”.
He told The Sun: “It’s hard now not ever having your twin brother around to experience this life that I have now got, knowing that we used to have an argument or a disagreement and we’d just get over it and it would be fine.
“It sounds weird but I hope we just sit in a room and go, ‘It was a bit of a silly eight years wasn’t it?’”
Olly’s comments came after Ben took his wife’s surname in a bid to move on from the rift with his brother.
“Ben Hart. That’s my identity,” he told the Daily Mail at the time.
“I am blessed with my in-laws, they have supported me through this. I have had some very low times where I have cried a lot but I have spoken to them about it all and they are my safety blanket.
“I just wanted to move on. I couldn’t cope with it all – if I went into Barclays bank, I would be asked if I was Olly’s brother. I would just say ‘no’. If someone called me by that name now I wouldn’t even turn around.”