The rhyme scheme of the verses is AABBC, with each verse ending with the line "It's such a lonely world." Unlike the preceding pairs of lines, this final line lacks a complement, structurally mirroring this "lonel[iness]."
The rhyme scheme of the second verse differs slightly in that the first two lines exhibit a slant rhyme: "Then I knew that you were gone / It came to me: I was alone." In a way, the absence of a perfect rhyme here indicates the narrator's lack of companionship.