Wyclef Jean claims ex-lover and bandmate Lauryn Hill lied to him about the paternity of her son.
The hip-hop star had an affair with the singer during the group's 90s heyday and he says one of the reasons the band split was because Lauryn tricked him into believing her firstborn son was his, when, in fact, the father was Bob Marley's son Rohan.
In an extract from his new book 'Purpose', which was published in the New York Post newspaper: "In that moment something died between us. I was married and Lauryn and I were having an affair, but she led me to believe that the baby was mine, and I couldn't forgive that.
"She could not longer be my muse. Our love spell was broken."
Wyclef has previously hinted the romance was the catalyst for the group's split in 1997.
This is not the first scandal Lauryn - who has five other children - has faced in recent months.
In June, she pleaded guilty to tax evasion.
The 37-year-old singer appeared in federal court in Newark, New Jersey to admit she failed to file returns between 2005 and 2007, despite an income of more than $1.8 million from recording royalties.
She could face up to three years in jail - one for each count of evasion - and was released on $150,000.
She will face sentencing in November.