Oru Kadhal Seiveer (2006)

Kamesh (Santhosh), a playboy, meets the modern and practical girl Subha (Archana Galrani). Subha wants a non-committed relationship and the two start to hang out, and one day, they even have sex. Kamesh slowly falls in love with her and wants to settle down in life, so he asks her to marry him but Subha declines. Thereafter, Subha agrees for an arranged marriage with the engineer Anand (Krishna) who is also Kamesh's best friend. The young couple moves to Ooty. Kamesh is still obsessed with Subha and wants to have sex with her one more time, so he arrives in Ooty and stays at their home. Kamesh starts to lust for her but she refuses to cheat on her kind-hearted husband. Kamesh then tortures her mentally for sleeping with her and Subha eventually accepts and brings him to a hotel. There, she gives an interview for the journalists she has invited and Kamesh is dazed. Subha tells them that she had premarital sex with someone and he is now torturing her, she then takes a knife and stabs Kamesh to death. Subha is arrested for the murder and is sentenced to five years in prison. The film ends with Anand comforting his wife in jail and he swears that he will wait for her.