I'm totally guessing on this but to me it seems like a guy who's had a fight with a girl and he can't focus on anything else thats going on but her hence the lines:
What am I supposed to do when I don't know
Seven twenty-five, I'm leaving for the big plans
What am I supposed to do when I don't care
and then he starts to get a little mad at why he can't figure out why she's mad and he's mad because he misses her and she's not talking to him
I'm totally guessing on this but to me it seems like a guy who's had a fight with a girl and he can't focus on anything else thats going on but her hence the lines:
What am I supposed to do when I don't know Seven twenty-five, I'm leaving for the big plans What am I supposed to do when I don't care
and then he starts to get a little mad at why he can't figure out why she's mad and he's mad because he misses her and she's not talking to him
basically she's all he thinks about