Johannesburg - Sindisiwe Manqele, the girlfriend accused of killing hip hop star Nkululeko "Flabba" Habedi, denied in court that the couple often argued over his ex-girlfriend. In fact, she told the High Court sitting in Randburg on Tuesday, she did not even have any knowledge of an ex-girlfriend, known as "Kea".Several state witnesses have testified that Flabba was stabbed to death after the pair argued over Kea.One of Habedi's friends, Nkululeko Chauke, told the court earlier that he had heard Manqele accusing Habedi of flirting with Kea while they were at a club in Sandton.It was understood that Kea was at this time in a relationship with another hip hop artist, JR, and the couple was among scores of people at The Sands nightclub.Chauke said Kea came to the table where he was sitting with Habedi and Manqele. He claimed that Kea danced in front of them.But Manqele said on Tuesday that this had not happened."I didn't see a lady dancing and beating her bum," Manqele told the court.Habedi's cousin, Luyanda Silupa, however, also previously told the court that when the couple returned home, he was in his bedroom when he heard them arguing and the name Kea was mentioned.The 26-year-old is on trial for Habedi's murder. He was stabbed in the heart at his Alexandra home.She has pleaded not guilty to murder and claims to have acted in self-defence.She took the witness stand on Tuesday, when she was asked if she had used dagga on the night of the killing. Chauke had told the court that he had witnessed Manqele smoking marijuana.But Manqele said she smoked only cigarettes that night.She remained composed during her testimony.Habedi's brother sat in the front row of the public gallery, watching her closely.