The Good Girl (2002)

Justine is thirty years old and works as a discount store clerk in Texas. Deeply unhappy in her marriage to a man who is infertile because of a dope-smoking habit, Justine soon begins an affair with Holden, the store's newly hired cashier and becomes pregnant. Holden, who has serious issues of his own, steals money from the store's safe for the two of them to run away, but the plan is short-lived when it takes a tragic turn for the worse.