The speaker is in love and terrified of losing that feeling. The poem is titled "Madi," which reads like a name, so it seems to be addressed to someone. The epigraph, "Lightning," hints at what the love feels like: sudden, bright and powerful, but also brief. That image sits behind the whole poem, because lightning is exactly the kind of thing that flashes and then disappears.
The speaker imagines looking at the person they love and feeling nothing. The questions come in short, halting lines, and the plain wording makes the fear feel honest and raw. "What will I do then" ends without a question mark, as if the speaker already sounds a little defeated. The final line, "There is no one else for me," is the most striking. It could be read as devotion, but it also makes the fear heavier, since losing the spark would leave the speaker with nothing. The mood is vulnerable, anxious and intimate.