I think it's about a serial relationship... you know, you break up and get back together and break up and get back together again... looks like this happened three times, and she broke up with him again, and it hurt, but this time he is determined to get over her instead of trying it again, because he knows it won't work. So, he's not over her now, but he feels like he will be soon (tomorrow) and he's tired of their relationship bascially being them trying to stay together because it was good once (yesterday).
I think it's about a serial relationship... you know, you break up and get back together and break up and get back together again... looks like this happened three times, and she broke up with him again, and it hurt, but this time he is determined to get over her instead of trying it again, because he knows it won't work. So, he's not over her now, but he feels like he will be soon (tomorrow) and he's tired of their relationship bascially being them trying to stay together because it was good once (yesterday).