A teenage girl stabbed a 14-year-old boy after accusing him of dating her female lover. Tsang Ngar-sze, 17, lashed out at Wai Chi-ho, leaving a 3cm gash on his arm. Magistrate Garry Tallentire heard in Eastern Court that the teenagers had argued about their relationship with the 15-year-old girl. Tsang pleaded guilty to wounding Chi-ho, whom she believed to be her love rival, in Quarry Bay Park on August 13. 'A friend had informed Tsang that her lover had been with the boy in the park,' said prosecutor Esther Mak. The victim was admitted to Eastern Hospital. Tsang was arrested four days later when she tried to visit the boy in hospital. Mr Tallentire adjourned sentencing until September 7, pending a probation report.