Lyric discussion by cwilloug 

Cover art for My Worst Nightmare lyrics by Forever the Sickest Kids

i'm think its about a guy being away for a while, and his girlfriend thinking that he cheated while he was gone, and then cheated as payback.

So he's come home to try to work things out but is realizing he can't get over what she did to him and she won't talk about it because she thinks he's lying