I think the meaning of this song is that she lived with her boyfriend/husband, and they used to get along well, but something happened, & now she just wants out. I know this feeling. I used to live with my bf, but then he F*ked up & all I wanted to do was burn his house down & leave. My favorite part is "pictures framing up the past, your taunting smirk behind the glass" b/c when I had to see the pictures of me & my ex, it was terrible b/c he had a smirk on his face in all of them!