All fall down and lost in the mystery
Lost it all to a non-believer
And all that's left is a girl
Who's loved by her mother and father

from The Beach Boys – Wonderful Lyrics on Rap Genius

Meaning

The boy and girl supposedly fall in love or at least the girl believes they are in love. In the end she loses everything: the boy, the love she thought he had for her and I’m even inclined to think her virginity.

Lost it all to a non-believer

Hints that the boy, unlike the girl, didn’t want to wait until marriage

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