Buddy Holly's "You Are My One Desire"

This morning I listened to a compilation album of Buddy Holly titled Oh Boy, and I noticed something about "You Are My One Desire."  The "love" in the line "You'll never know how much I love you" has a melisma (the notes are B A G).  At first I just thought that because there are multiple notes instead of the single syllable with which "love" is pronounced when spoken, there's a musical representation of the greatness of the singer/speaker's love.  But then I realized that there's more to it than that.  When I was looking at the lyrics I'd transcribed, there was no indication that the "love" in that line has a melisma, and that itself mirrors the lyric.  "You'll never know how much I love you" when the words are written, but there's some indication of it (although that might not be an adequate representation either) when those words are sung.