Someone who swore they were over a crush finds out they aren't. The speaker opens with confidence, listing the things they thought had cured them: the messy house, the smelly dog, the plain white t-shirts. Then comes a flat "Nope." From there the poem is a slide back into old feelings, full of blushing, quiet stares, and jokes only the two of them get.
The mood is funny and painful at once. The repeated "again, and again, and again" makes the longing feel like a loop the speaker can't escape, and the crying sits right beside the laughter. The brackets add a teasing, honest voice, like "(What other guy has both?)" and the admission that there's no "we" yet. The best moment is the stumble from "lov-" to "LIKE, I MEAN LIKE!!!", where the speaker nearly says too much and panics. By the end, "Here I go again" returns with less denial and more resignation, as if the speaker already knows how this will go.