Four short lines, and a whole argument fits inside them. The speaker begins with a flat confession, "I don't like this world," and then, after a pause, makes a promise: if living will make "you" happy, then "I will live for you, / Forever." The poem is about the gap between wanting to be somewhere and choosing to stay there out of love. Its central idea is that devotion can be a form of endurance. The speaker doesn't claim the world has changed or that life has become lovely. The only thing that has changed is that someone else's happiness is now a reason.
The first line is worth slowing down for. "I don't like" is an oddly mild phrase. The speaker doesn't say "hate" or "can't bear." The understatement makes the line sound tired rather than dramatic, as if this is a settled fact the speaker has stopped arguing about. It is also the only line pressed against the left margin. It sits alone, a complete sentence ending in a full stop, and the rest of the poem is a response to it.
That response arrives as a single conditional sentence, and its logic is almost like a contract: "if living will make you happy, / Then I will live for you." The word "living" is telling. It is treated as a means to an end, something done in order to produce happiness in someone else, rather than as a good in itself. The repetition of "will" ("will make," "will live") gives the promise a determined, future-facing sound, though the opening "if" keeps it fragile. The vow depends on a condition the speaker cannot fully control, because they can't guarantee that their staying will actually make the other person happy. The poem doesn't say who "you" is, and that blankness lets almost any reader step into the role, whether as the person being promised to or as the person making the promise.
The preposition "for" does a lot of quiet work. "I will live for you" can mean "for your sake," but it can also mean "on your behalf," as though the speaker's life were something handed over rather than owned. Compare it with "live with you" or "live beside you," which would sound warmer and more equal. "For" sounds like sacrifice. The poem lets both readings stand: this is a gift, and it may also be a weight.
Then there is the final word. "Forever" is usually the most romantic word in the language, the sort of thing said in vows and love songs. Here it lands after a confession of dislike for the world, and it changes character. Forever in a world you don't like is a very long time. The poem doesn't resolve whether this is tender or sad, and it is probably both. The title, set in guillemets as «forever», announces the ending before we begin, so by the time we reach the last line we are already carrying it. The word comes back to us as an echo, and also as something we were warned about.
The layout reinforces this. The lines are staggered across the page, each indented further than the one before, so "Forever." ends up stranded far out on the right. The eye has to travel to reach it, and the white space behind the word makes it feel like a long distance, or a long wait. It also suggests a slow, reluctant stepping forward, one line at a time. There is no rhyme to tie the lines together. "World" is never answered by a matching sound, which suits a speaker who feels unanswered by the world. The rhythm is plain and speech-like, with a slight lilt in "But if living will make you happy" before the shorter, steadier "Then I will live for you." The last line shrinks to a single word and a full stop, which closes the poem as firmly as the first line opened it.
What makes the poem significant is how much it does with so little. It treats a heavy subject, how hard it can be to keep going and what might keep a person going, without melodrama or explanation, and it leaves the reader to fill in the reasons. It also avoids the easy comfort of a happy ending. Love here is not a cure for the speaker's feelings about the world. It is a reason to stay in spite of them. For many readers that will feel truthful, and the poem's quietness is a large part of why it sticks.