Four times the same words come round: "When you were here before." Jessea L. Vaughan builds the whole poem on that phrase, and it works less like a song refrain than like a door being slammed, then slammed again. Each return adds another charge to the list of damage, until the last line turns the phrase into a reason: "You're not welcome anymore / Because you ruined everything." The poem is about a person who took up all the space in someone else's life and left it wrecked. The speaker now refuses that person's return. The title and the repeated "before" suggest the visitor is back, or about to be, though the poem never says who they are.
The poem makes its case partly through grammar. The speaker never says "I." They appear only as "me," "my" and "mine," always on the receiving end of someone else's verbs: "never thought of me," "threw mine aside," "crushed my spirits." Meanwhile "you" crowds almost every line. Even "You and only you" is a twisted version of a phrase usually found in love declarations, here turned into a charge of selfishness. The word "thought" is also used twice, first as something withheld ("never thought of me") and then as a closed loop ("That was how you thought"), so the other person's mind is shown running in one direction only.
The imagery stays close to the household. "Yesterday's newspapers" is a quietly cruel comparison. The speaker's wishes were not even hated, just treated as stale news, used up and ready to be thrown out. The cockroach simile is harsher and deliberately ugly. People crush cockroaches without a second thought, with disgust and a shoe. To be "crushed… like cockroaches" is to be treated as something beneath notice. Judging by the imagery, there may also be a faint note of survival here, since cockroaches are famously hard to get rid of, and the speaker is still standing to write the poem.
The middle of the poem turns the speaker's life into a haunted building. "Your footprints on the floor / And your shadows on the walls" are traces of someone who has left but not disappeared. The impersonal "one" in "landmarks one can use" gives the passage the tone of a detective at a crime scene, calmly pointing out evidence. The "ghosts / Of my dead, decaying dreams" pair two words that overlap in meaning. "Dead" says the damage is done, while "decaying" says it is still going on. The shift from past to present tense supports this: "Are the landmarks" and "You're not welcome" are in the present, so the harm is still in the house. The poem's "house" and "place" seem to stand for more than rooms. The text slides easily between a building and an inner life.
The most memorable image is also the most exaggerated: the sadness could only be washed out by "an ocean / And maybe half another." The line break lets one whole ocean sit there before the extra half arrives. That "maybe" adds a note of dry, almost businesslike estimating, as if grief were a cleaning job too big to quote for.
Formally the poem is free verse with no regular rhyme scheme. Its only rhyme is the repeated "before," which ends the lines that open each section and the final line. That repetition works like a lock, since the visitor is trapped inside "before" and the poem will not let them move forward. The short lines and plain, mostly one-syllable words sound like spoken accusation, and breaks such as "You only wanted / Things your way" leave a word hanging for a beat before the complaint lands.
The poem matters because it keeps its anger under control and avoids grand language. It uses newspapers, cockroaches and floors to make emotional damage feel real. There is also an irony in it. The speaker rejects someone for thinking only about themselves, yet the poem keeps "you" as its subject to the very end. That suggests how hard it is to evict a person from memory, even once the door is finally shut.