Someone has hurt the speaker, and that hurt won't fade. The poem is addressed directly to "you," a person who seems to be gone from the speaker's life but not from their mind. The speaker calls the pain unbearable and says they hate it, yet admits it has never left. The reason given is striking: the speaker knows the other person is "there," waiting and watching, even while the speaker cries themselves to sleep.
The image of a glass wall is the heart of the poem. Glass lets you see someone but not reach them, so it suggests a separation that is clear and painful at once. The "you" can't help, and the speaker can't cross over. The short, blunt final line, "We are separated and that's that," sounds resigned, almost flat, as if the speaker has run out of arguments. The mood is raw, lonely and stuck, with anger and longing tangled together. The title, which mentions throwing away flowers, hints at rejecting a gesture of comfort, though the poem itself never explains it.