Lyric discussion by stonelions 

Cover art for Young Girl lyrics by Gary Puckett & The Union Gap

I thought it was kind of obvious that he wasn't engaging in a relationship with the girl "on purpose." By that, I mean that he didn't know she was as young as she was.

You've kept the secret of your youth You led me to believe you're old enough To give me love And now it hurts to know the truth

^ Obviously, she had lied/led him to believe otherwise about her age.

Before he knew, however, he had fallen in love with her. When he finds out, he's appalled with himself, and tries to convince her (and himself) that the love is not real, and should not exist inside his mind anymore.

My Interpretation

@stonelions Exactly. A lot of people think this a song is about a paedophile preying on a young girl when its just the opposite. A decent guy discovering a girl is too young for him and pushing her away. I guess some people just don\'t listen to the full song.