Lyric discussion by Cha Cha Cha 

Cover art for Paper Bag lyrics by Dear and the Headlights

the line "I didn't know the things you never did could stay with you your whole life"

mean that he didn't know that she could keep secrets and lies from him forever. he thought she would just open up and be honest with him. he is afraid to trust anyone or anything

"And it seems everyone around me is So good at faking it that I don't know Just how to act around you And how to act about you"

he doesn't even know how to treat people because he doesn't know if there lying or being truthfull with him...

this is very ME right now... and i'm sure alot of other people feel this way as well