Lyric discussion by Loveglove 

i think as katana08 said its about lookin back on the times enjoyed but than suddenly it hits that this dream might end and paranoia sets in I can’t do well when I think you’re gonna leave me, But I know I try, Are you gonna leave me now, Can’t you be believing now.

or it could mean that the person was just dumped and he's tryin to get his partner to realise the good times they had together

Can you remember and humanise, It was still where we’d energised, Lie in the sand and visualise Like its 75 again,

I know everything about you, You know everything about me, Know everything about us

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