The speaker returns home to "her," the only one still there. The poem never says outright who she is, and that openness is part of its power. She could be a person, a place, or even the speaker's own reflection, since the last line says she is thought of "only" as one. Either way, she is described as bound: "chain to the neck," unable to leave, yet also "forgotten and abandoned." The contradiction is sharp. She stays faithful, and nobody pays her any attention.
The speaker seems tender and a little frustrated. "Just think of it" reads like a plea, asking us to notice something we have taken for granted. The final line turns on a "you," accusing someone of reducing her to a mere reflection, a surface rather than a living presence. The mood is quiet, sad and reproachful. Short lines make her loneliness feel stark, and the poem leaves us wondering who has been ignoring her.