“Oh no, did I get too close?
Oh, did I almost see
What's really on the inside”

Katy Perry – Unconditionally Lyrics on LyricsMode
EXPLANATION
This song is about a she really likes and he's acting a bit shy.
EXPLANATION
This song is how she likes a guy but he likes all the fake girls out in the world until he sees her and then he knows how wrong and stupid he is for liking the fakes.
EXPLANATION
There is a guy and he is afraid of having his past or secret spill out. He's afraid of her finding out who he really is.
EXPLANATION
She likes this guy, but she's scared to see what is on the inside. It seems she has a sense of knowledge of what he is really like (the bad side), but she doesn't want to see it, because she doesn't want prove herself right and then maybe change her mind on him.