A HOUSEWIFE who set her home on fire when she discovered her husband had a mistress on the mainland was reunited with her errant spouse yesterday after being spared a jail sentence. Judge Hawkes agreed to put Ngai Shing-yuk, 34, on probation for 18 months on condition she receive counselling and psychiatric treatment. Ngai started the fire in her second floor flat in Yue On Yuen, Ap Lei Chau, in the early morning of May 27 last year, the District Court heard. Ngai, who pleaded guilty to arson, had been left entirely responsible for their three children while her husband was away with his concubine over the border. But the judge was told the drastic act had brought Ngai's two-timing husband Tang Wai-ming back to her. Prosecutor Michelle Tsang said Mr Tang had rushed out of the blazing flat in his pyjamas shouting for help. He was followed by his wife, 11-year-old daughter and two sons aged nine and three. When police arrived on the scene Ngai told them: 'I wanted to die. I started the fire. You can arrest me.' A pair of slippers stained with the inflammable liquid toluene was later found at the scene. A hose connecting the stove to the main gas pipe had also been cut. The court heard Ngai had a 10-year history of depression and had suicidal tendencies. Defence counsel Yeung Ming-tai said yesterday Ngai was of low intelligence and her husband's infidelity had caused her extreme stress. Passing sentence, the judge told Ngai: 'Fortunately the damage was only small and no one suffered any injury. A prison sentence is not called for.'