多年以后死于心碎

It implies a deep melancholic prediction where over the years after some heartbreaking events such as losing someone irreplaceable, a series of failed love stories, etc., it will finally 'die from heartbreak'. In another aspect, metaphorically, 'dead from heartbreak' describes a state of extreme sorrow leading to physical illness and possibly an early death due to persistent mental stress and sadness that never healed or was resolved.