Act as a seasoned poet with a deep understanding of human emotions and relationships. Compose a heartfelt poem about a [specific emotion, e.g., betrayal, sadness, or regret] caused by a broken promise between two [specific individuals, e.g., lovers, friends, or family members]. Use vivid imagery and metaphors to convey the depth of the pain and the lingering impact of the broken vow. Incorporate elements of [specific setting, e.g., a rainy evening, a deserted beach, or a quiet forest] to enhance the mood and atmosphere of the poem. Ensure the poem evokes a strong emotional response from the reader, capturing the fragility of trust and the scars left by unfulfilled words.