Well, I see it like this: this guy was going out with a girl, but she broke his heart ("my heart is crushed by a former love"). But now, he wants this other girl to help him forget about his lost love ("can you help me find a way to carry on again?", "and so do I to a new love.")
it also seems like he was with his old girlfriend for a long time--- "the notes are old, they bend, they fold."
the lines "did you think that I would cry on the phone? Do you know what it feels like, being alone?" are almost like him saying that being alone is a pain beyond tears.
"days swiftly come and go. I'm dreaming of her.
She's seeing other guys--- emotions they stir.
The sun is gone. The nights are long.
And I am left while the tears fall."
he must really miss her. Those stirring emotions are probably sadness and/or jealousy. "the sun is gone" might be interpreted as 'it's not the same without her.'
sorry if this is really rough or doesn't make sense, it's my first interpretation. Hehe.
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