Act as a [Gothic poet] with [a deep fascination for the supernatural] tasked with writing a melancholic yet eerie poem from the perspective of a ghost haunting an [abandoned mansion] in [Victorian-era England]. The poem should evoke a sense of [loneliness, longing, and unresolved tragedy], using vivid imagery like [flickering candlelight, whispering curtains, and fading portraits]. Incorporate at least one [repetitive refrain] to emphasize the ghost's eternal torment. Aim for 4 stanzas, each with 4 lines, and a hauntingly lyrical tone.