The 28-year-old pop star and his three bandmates - Aston Merrygold, JB Gill and Oritsé Williams - shocked fans by announcing that they will no longer be recording music together back in April.
They have now embarked on one last arena tour, before they will officially call it quits in the new year.
Marvin thinks the split has come at the right moment, as the boys are still best friends and have managed to avoid any arguments or rifts in the group.
He told Reveal: "The great thing about the four of us is we are still friends. We've called it a day at the right time. We've not had arguments or fallouts and we still socialise together and that will continue. It's going to be like we haven't split up in a way because we will still socialise like we do now."
Bandmate Oritsé, 27, echoed Marvin's sentiments by insisting that the boys consider themselves "brothers" first and foremost.
"We've always said that we are 'brothers, band mates and then business partners'," he added. "The 'brothers' comes first for a reason. For us, we built that friendship first. We still see each other so much. Me and JB live close and Aston and Marvin close. And our families are all one big family as well."
As well as treating their beloved fans to one final farewell tour, JLS will be releasing a DVD titled Goodbye: The Greatest Hits Tour today (9 December), which will include footage from their last shows and various memories from their past five years together as a group.
Oritsé explained that the DVD is a way of reminding fans that they've been a part of the JLS journey too: "The Greatest Hits Tour DVD is going to be every thing we've achieved over the last few years – all the great memories and even those hard moments, like when we were in the bottom two on The X Factor," he explained.
"What people are going to get from the DVD is a sense of nostalgia. That's what is so special for us. This DVD is going to come out faster than any other music DVD ever in music history because fans are going to get it immediately after the tour comes to an end. It will be a lovely document of what fans have been a part of."
But don't expect the four boys to reveal any deep, dark secrets know that they're splitting up, as Oritsé says they don't have any!
"If [any secrets] were going to come out, they would have come out on The X Factor [in 2008] because that show digs so deeply into your life," he said. "Everything is exposed."
Marvin added: "We were lucky that we weren't too young when we started. I'd already been in another band too."
With their time as a band almost up, the split is beginning to really sink in for the guys.
However, Marvin insists that although they are each starting to feel sad, this is also a happy time.
He said: "Every show that we're doing we are consciously aware that we are one less away from it being the final one. Of course it's an emotional time for us. We've spent literally every day together for the last seven years and at the end of this year it's not going to be like that. But it's a fun time too. It's a celebration of our career."
Oritsé added: "We'll still be supporting [one another]. We've got our own lanes that we want to go down. And hopefully if we've all got our own lanes, we'll all be in different aspects of the business so we can support each other even more. Marvin could play our songs on the radio or we could ask JB for some food from his farm!"
Despite cramming as much as possible into their five successful years together as a band, Oritsé admitted that there will always be one thing he regrets not doing with Marvin, Aston and JB: going on a rollercoaster!
"I wish I'd joined the boys and gone on the fastest rollercoaster in the world when we did the Six Flags tour in America," he said. "I'm always going to wish I'd gone on it!"
Meanwhile, Marvin reflected on his proudest moment as part of JLS.
He recalled: "If I had to pick one achievement that summed up our time as a group it would be double BRIT Award winners. We were the first X Factor act to win a BRIT.
"I remember, when I was 10 years old I did an interview with my local newspaper and I said I want to win the BRIT for Best Song. And we did it."
JLS Goodbye: the Greatest Hits Tour Live is out on DVD now.
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Copyright: WENN ITV
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