Lyric discussion by Yumi 

Cover art for Alone lyrics by Avril Lavigne

Basically I think it's about the guy being a jerk or saying/doing something which hurt their relationship badly and he's too idiotic to even realize it, so she leaves him.

Perfect contrasting b-side to 'Girlfriend' in my opinion, lol. Although since song sounds alot better than girlfriend to me with the digital sounding effects and much stronger tune.