Currently making the most of a revival for ITV2's The Big Reunion - which has seen Liberty X, 911, Atomic Kitten, B*Witched and Honeyz get back on stage - he told Heat about his former fling.
When asked about his relationship with Scott-Lee, he said: "I'm not going there," but his bandmates described it as "a full-on f**kfest".
[Lisa Scott-Lee and Ritchie Neville back in the day]
The '90s band, made up of Neville, Abs Breen (now Abz Love), Scott Robinson, Sean Conlon and formerly Jason 'J' Brown, said they couldn't remember how many women they had been with during their time in the limelight.
But Abs admitted it had been in the region of "500 to 1,000 and 80% was between the age of 15 to 17".
Of their previous years in the band, Abs said: "I went on a bit of a mad one and nearly killed myself. Seriously. Now I live on a farm and I'm a good boy now."
While Neville admitted that he was "lost and depressed" when the band split, he said: "I'm not going to lie; I was also smoking a little bit too much. I didn't know what I wanted to do."
Abs added: "F**k yeah. I had nothing. I had to go to my mum and ask to borrow rent."
[Left: 5ive / Right: Steps]
Watch the video for 5ive's 'When The Lights Go Out' below: