The speaker is saying goodbye to someone they have cared about for six years, and the poem reads like a quiet, private farewell. It begins with a painful question: who am I to you? The speaker answers it themselves, assuming they are just "a girl," "a stranger," a blur in the other person's memory. But they insist the feeling isn't mutual in that way. To them, this person is a best friend, a crush, and a real, good human being, not just a name and a faded face.
The mood is sad but gentle. There's no anger here. The speaker decides it's time to let go, hopes the other person finds someone, and refuses to "stand in your way." The repeated line at the end, along with "I'll miss you," shows that stepping back is an act of love, though it clearly hurts. The title suggests a similar gesture: throwing something away that once felt hopeful.