Because of You (1952)

Blonde 'doll' Christine Carroll finds too late that her fiancé Mike is a gangster and she's his unwitting accessory. Emerging from prison with dark hair and an interest in nursing, she becomes a nurse's aide in a war hospital where her good looks quickly arouse the interest of battle-fatigued, 'melancholic' patient Steve Kimberly. When it's clear that Steve has fallen hard, she faces the dilemma of what and when to tell him. Her decision has melodramatic consequences.