Lyric discussion by PorcelainLies 

Cover art for Creepy Crawl lyrics by Be Your Own Pet

So I can see this going in two different ways.

First, and what I think is more likely, is she wasn't the best girlfriend, and now they have broken up, and she doesn't feel like the same person, blah blah blah.

Second, I think it could be about going on tour and coming back and feeling different, and more grown up.