Last week, I listened to a compilation album of the Everly Brothers that I got for Christmas. Although I'd heard the song before, I noticed something new about "When Will I Be Loved."
The first three lines of the bridge ("When I meet a new girl / That I want for mine / She always breaks my heart in two") are sung by only one of the Everly Brothers. They both sing the final line of the bridge ("It happens ev'ry time") and the entirety of the verses.
In a way, the single voice represents a whole heart, and the two voices represent a broken heart. When the speaker/singer "meet[s] a new girl," his heart is intact, but after "she... breaks [his] heart in two," there are two voices. The verses are all in present perfect tense ("I've been made blue," "I've been turned down," "I've been cheated"), so while two verses do precede the bridge structurally, they actually follow it chronologically.
