Tulisa Contostavlos has revealed that she feared her former boyfriend Fazer was cheating on her.

An extract from her forthcoming biography Honest claims that Fazer, who was in N-Dubz, publicly called Tulisa a "psychopath" over her cheating fears.

She reckoned that the emotional struggles, which had poured out onto the street, belied her new found status as a "glamorous" X Factor judge. Tulisa says in her autobiography:

"There was a massive banging on the front door. It was three o'clock in the morning but outside someone was screaming the place down and going mental. 'You're a psychopath', my boyfriend and former bandmate Fazer shouted from outside. 'I ain't done nothing, you have to believe me'."

She continued: "It was only a week after I'd finished judging The X Factor last year, one of the highlights of my career. The public were seeing me as some glamorous TV star but in reality, there I was, being dragged back down to earth and having to deal with the same old cr*p I'd been dealing with for years."