The speaker questions how they can be alone when there is no true lover or recipient of their affection. They lament that their full cup of love remains unvalued because there is no suitable chalice to receive it.

This couplet expresses a profound loneliness, not just from being physically alone, but from a deeper lack of connection. The poet questions, "Who says I'm alone?" implying the real solitude comes from a world where genuine lovers or appreciative hearts are scarce. It's like having a cup overflowing with love and emotions, but there's no one, no 'goblet,' to receive or truly value that abundance. It's a poignant reflection on unshared passion and the pain of feeling misunderstood, even when your heart is full to the brim with affection and longing.