Unsuspecting Sunday Afternoon Lyrics

Lyric discussion by Krylon 

Cover art for Unsuspecting Sunday Afternoon lyrics by Backstreet Boys

I think this song is about a guy who's in love with a girl that keeps disappointing him. He has these great moments with her, and it's magical just like the fireworks, but then when that unsuspecting Sunday afternoon arrives, his heart gets shattered again. He's not sure what's gonna happen next, so he doesn't know if this is the end or only the beginning.