Calcutta, July 7 :    Calcutta, July 7:  A 22-year-old girl committed suicide by injecting insulin on Friday night at her lover's flat at Rabindrapalli, in Baguiati. She was identified as Mala. The police described the incident as the tragic end of a love story. A 26-year-old student of chartered accountancy, hailing from Tinsukia in Assam, had rented a room in the city. Mala was a student at the institute where he studied. Gradually they became emotionally involved. But Mala's family was opposed to the match. The young man left for home recently. He had asked his landlord to hand over the keys to Mala if she came. Police said Mala told her parents on Thursday that she was going to a friend's house. When she did not return till late at night, a missing diary was lodged. Investigation revealed that Mala had gone to her boyfriend's flat and locked herself in. On Friday night, on finding the door locked, the landlord informed the police. The police broke in and found the girl lying on the floor. A note scribbled on the wall read: 'I can't stay without him. I am dying of my own will.' Police said the girl's mother was a diabetic patient and she possibly got the insulin ampules from her mother's medicine kit. The body has been sent for post-mortem.