Stephen Belafonte accused Mel B of sleeping with Simon Cowell before their reported bust-up on the eve of The X Factor final in 2014.
The 41-year-old missed the first night of the live X Factor final after her estranged husband locked her in a room and accused her of bedding talent boss Simon.
The former Spice Girl was later treated in hospital for an overdose of aspirin, and had visible bruises on her face and arms when she returned to the show the following day.
A source told The Sun, “Stephen’s jealousy caused problems in the marriage and he was convinced something was going on between her and Simon. He thought she was up to all sorts.”
Abusive: Mel B is going through a messy divorce | WENN.com
“It caused huge arguments and led to a loss of trust. It is one of the things that led to the breakdown of their relationship.”
Meanwhile, a source close to Simon has said, “Belafonte is an odious character. His claims are laughable.”
The news comes after it was reported that Mel has been given extra security while filming America’s Got Talent – amid fears from her safety.
The singer is beefing up her security just weeks after filing for divorce, and claiming that Stephem beat her up, got their nanny pregnant, forced her to engage in threesomes, and blackmailed her with alleged sex tapes.
Scared: Mel has beefed up her security | YOUTUBE
“Mel is petrified about her safety and fears Belafonte may attempt to crash the filming to see her,” an insider told the Daily Star.
“She is living her life in fear about the ramifications of filing legal papers of divorce and the restraining order.”
Simon Cowell is said to be helping Mel out, ordering more bodyguards on set, and even positioning some in the AGT audience.