I think its a song about love a friendship.

Young people living there summers together, even though they are short. "the winters so cold, summer is over too soon"
And how even though they have only just met they feel theve had the best times of there life, and there dreams.
How they waste there days dreaming, comparing scars and stories. Swinging life away basicly.
"we chase these days down with talks of the places we will go"

Love because at the start its a couple, low on money strying to start over, and unwrite the pages.
He misses her as they are apart, he wants them to get together and move away from the stress of life. He is waiting for her, he knows she will come " I wont cross these streets until you hold my hand"
He will do anything for who he loves "if love is labour, ill slave till the end"