I think that "tomorrow you didn't, yesterday you won't" means that she sees what's going to happen, and that's she's just going to be let down again. "When it comes to your promise, it's just a lotta empty words to say... and the future's only gonna be more of the same." I think that means that he's done it before, he does it all the time, so she knows he's not going to do it tomorrow.
Kinda like being let down over and over, and finally it just becomes this pattern that is so predictable.
I think that "tomorrow you didn't, yesterday you won't" means that she sees what's going to happen, and that's she's just going to be let down again. "When it comes to your promise, it's just a lotta empty words to say... and the future's only gonna be more of the same." I think that means that he's done it before, he does it all the time, so she knows he's not going to do it tomorrow. Kinda like being let down over and over, and finally it just becomes this pattern that is so predictable.