Ten short lines, and almost all of them are about a gap. On one side is what the speaker wants, a world where two people belong to each other. On the other is what the speaker has, which is the admission that they don't. Nothing is known here about who wrote the poem or why, so everything below comes from the words on the page. They turn out to be quite a lot.
The poem is built as a small argument with a conclusion nobody wants. It opens with a condition: "In the perfect world, / You would be mine, / And I would be yours, / And we'd be together." The grammar is all "would" and "'d", the mood of things that don't happen. The phrasing is careful, too. It says "the perfect world," not "a perfect world," as if there were one agreed place where things like this work out, and the speaker knows exactly where it is and that they aren't standing in it. The possessives are symmetrical: "you... mine," "I... yours." Neither person owns the other more than the reverse, and the wish is for a perfectly even exchange.
Then comes the turn: "But since we live in the real world, / We're not." The "But" ends the daydream. The line that follows is the shortest in the poem and ends on a word that answers "we'd be together" without repeating it. The speaker never writes "not together." The word is simply missing, and so the sentence has a hole exactly where the togetherness should be. The form acts out the loss. "Perfect world" and "real world" also echo each other, with the same noun and only the adjective changed, so the reader hears how little separates the two and how completely it matters.
The poem gives no reason for the separation. "The real world" could mean distance, circumstance, a breakup, or something unspoken. That vagueness works in the poem's favour. Without a story to follow, the reader supplies their own, and the poem fits many situations. The speaker doesn't blame anyone either. "Since we live in the real world" sounds more like a tired shrug than an accusation.
The last stanza drops the conditional and switches to plain present-tense feeling. "I miss your touch, / I miss your warmth" repeats the same phrase, and the repetition reads like someone listing what they can't stop noticing. The imagery is bodily and sensory rather than visual. Touch is contact, while warmth is what contact leaves behind. Warmth only gets missed in the cold, so the word quietly shows the speaker's present state without describing it.
The key move is the last line. After "touch" and "warmth," which belong to the other person, we might expect "I miss you." Instead the speaker writes "I miss us," and the poem has already prepared for this. The title puts the word in quotation marks, «Us», as though it were a thing with a name, a third presence made of two people. In the opening lines the speaker thinks in terms of ownership, "mine" and "yours." By the end, that language has dissolved into a single shared pronoun. What hurts is the loss of the combined self that only existed when the two were together.
Punctuation adds to the effect. "And most of all;" ends with a semicolon, where a colon or dash might be expected. Judging by the rhythm, it works like a held breath, a pause before the hardest admission. Then the final line has no full stop at all. The poem does not close, which suits a feeling that hasn't resolved.
There is no rhyme, and the lines are short and plain. Most of them are simple statements with little ornament. The rhythm is conversational, closer to someone speaking quietly than to a performance. The poem is not showing off, and that restraint is its strength. A more elaborate poem might bury the feeling under metaphor, but this one states it directly and trusts the structure to carry the weight.
Its significance lies in that honesty. The poem shows how longing can be organised: first the wish, then the correction, then the ache. It also shows how much a single well-placed pronoun can do. By choosing "us" over "you," the speaker says that the real loss is the shared life, not only the person, and the line works because it says so in the plainest way possible.