Lyric discussion by Teensiie 

it's obviously about how he's missing someone and he's not the same without her. he's constantly reminded, and likes it, by photographs etc. he hates being alone, and he knows it's because she's gone.

"the worst is over now & we can breathe again" probably means they made up their argument and realize they need to get better, their both lonely and not the same when their not together.

:) pretty much a couple who argues but knows they love each other.

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