the song is about falling out of love, wanting other girls, yet still wanting the best for that person. he wants that person today, because he's afraid of being lonely, but doesn't want a relationship anymore. he's too afraid of being tied-down. but he knows he's being an asshole, that all of this is bullshit, but he can't ignore it. if he could, he'd date someone new now, and then just go back to the original girl later. that's why he's telling her to run ahead, because she's better than him, because although he loves her, he just wants what's happening right now, not the future. he only wants today, what he can't have.
the song is about falling out of love, wanting other girls, yet still wanting the best for that person. he wants that person today, because he's afraid of being lonely, but doesn't want a relationship anymore. he's too afraid of being tied-down. but he knows he's being an asshole, that all of this is bullshit, but he can't ignore it. if he could, he'd date someone new now, and then just go back to the original girl later. that's why he's telling her to run ahead, because she's better than him, because although he loves her, he just wants what's happening right now, not the future. he only wants today, what he can't have.
god, good song :)