(idiom) to hold onto a deep regret or resentment for the rest of one's life; to die with regrets

eternal regret that lasts for the rest of one's life; a deep remorse that can never be undone

to die before one's allotted lifespan has run its course; to suffer a premature death

A sense of lifelong respect or longing; an eternal yearning for a loved one (often for deceased parents).