Shane Lynch has admitted that at one time he hated the Boyzone front man for leaving the band.
Speaking honestly in the new 'Boyzone at 20: No Matter What' ITV special, he and fellow band members discuss the band's split in 2000.
Fellow band member Mikey Graham says he felt "lost" in the band and was never sure where he "fitted in", while Keith Duffy admitted he always found it hard to cope with not being "one of the popular ones".
Ronan meanwhile confesses that he believes he worked harder than anyone else in the band: "“I had to stand up for myself. If I’m honest, I worked harder than anyone else in the band. Non-stop. That’s part of the reason I went ‘Hang on a second. I’m gonna do this lads, and I’m ok about it, because I’ve been doing it anyway.’ And I think the lads knew that. I don’t think we’ve ever really actually openly said that to each other, but I’m saying it now."
The band who are going over 20 years pay tribute to Stephen Gately, who died four years ago.
"We kind of feel he's in the room when the four of us are together," says Duffy who, from 2002 until 2005, played ladies' man Ciaran McCarthy in Coronation Street and recently had a stint on Love/Hate.
"We constantly reminisce about him because he was a character, great fun. Stephen did some fantastic performances, but most of them weren't on stage - it was in the dressing room."
The band recently reformed and are currently on a tour of the UK, they played Dublin's 02 last month and the Cheerios Childline concert, where they performed an Aslan number.
The ITV special is hosted by Dannii Minogue and is on ITV1 on Friday December 13 at 9pm.