Chennai: A 32-year-old woman was critically injured after a man stabbed her in the chest for ending their relationship near Mangadu on Thursday morning. Police arrested the suspect.Police said the victim, Kasthuri of Periya Koluthuvanchery near Paraniputhur, had been living with her children after separating from her husband. She and Sampath, 38, a tile worker from the same locality, became friends a few months ago.However, over the past few weeks, Kasthuri had been avoiding Sampath and eventually ended the relationship. Angered by her decision, Sampath entered her house early Thursday and confronted her. He then stabbed Kasthuri before fleeing. Hearing her screams, neighbours rushed to her rescue and took her to a govt hospital. Her condition is said to be critical. Mangadu police registered a case and arrested Sampath after inquiries.