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Speaking to Kate Thorton on her White Wine Question Time podcast, the reality star turned sweet manufacturer said Spencer doesn't have any friends apart from him and his wife, Vogue Williams.
He claimed that their Six Degrees from Jamie and Spencer podcast was a way for them to get Spencer some friends.
WATCH: Jamie Laing dishes the dirt on 6 degrees podcast co-creator Spencer Matthews
He said: "Spencer's only friends in his life are me, his wife and... I don't think his kids like him honestly!
"He doesn't make an effort with people and I make an effort with him because I find him so furiously irritating and interesting at the same time.
"And we've been friends for so long. It's like a toxic relationship you should get out of but you can't. And also, I feel sorry for him a lot of the time. Well, not really. But sometimes I do!"
He also spoke about his embarrassment when Made In Chelsea won a BAFTA award in 2013 for Best Reality and Constructed Reality TV show.
He said: "One of the most embarrassing moments ever [was when] Made In Chelsea won a BAFTA. And we cheered, we screamed, we came on stage.
"And I looked at the audience, and there was Olivia Colman, there was Benedict Cumberbatch all these people who have a talent and have gone through the schools of everything.
"And we have these bunch of posh people onstage who had won a BAFTA. And as Francis Boulle said: Who would have thought you could win a BAFTA for being posh?' And I've never felt more embarrassed!"
The pair also talked about podcasting, and Jamie revealed his winding up journalists on his time in Strictly Come Dancing.
He said: "Now I find it quite tricky with podcasting. Because I'm so used to asking the questions, I find it quite hard to be asked questions. You start like saying things just to make the interview really good!
"I remember when I was doing Strictly and I was just bored of all the interviews, and one of the journalists came up to me, and they said: 'Jamie, are you worried about the Strictly curse?' And I had been asked this so many times. And honestly, as I replied it was like people were trying to put out a fire.
"I went: 'I'm just worried I'm gonna get them all pregnant.' It was honestly, they couldn't believe what I'd just said. I was like: "I'm not joking, I'm actually worried!"
Buy it: I Can Explain by Jamie Laing | £10 (Was £18.99) from Amazon
WATCH: Jamie Laing on being posh, embarrassed and really in love