The speaker tells a short story about a girl they once knew, who fell in love with the moon. Every night she waits at her window, hoping to catch sight of it. The poem's quiet sadness comes from the fact that the thing she loves is impossibly far away. She "might've been too far," the speaker says, but she keeps hoping anyway.
The moon here reads as a symbol for any love that can't be reached, whether that's a person, a dream, or something lost. The speaker seems gentle and a little sad, watching from the outside. The last two lines are the most telling: her crying "didn't mean much," just "a way to cope." The speaker plays down her tears, but that almost makes them hurt more, because it suggests she's used to the ache. The simple rhymes and short lines give the poem a soft, lullaby-like mood, tender and wistful, with hope and loneliness side by side.