Lyric discussion by cadillac4life 

Cover art for Incomplete lyrics by Backstreet Boys

Wow...this song brings a whole new level of respect for BSB to me. The song is touching and introspecive, if not nearly as meaningful as many of the greats. In my humble opinion, this is their best work yet. Good work!

The meaning is fairly obvious: he's hurtin over a girl that left, he feels incomplete without her. You hardly have to scratch the surface to get that.