I should know

And you over think
Always speak
Cryptcally
I should know
That you're no good for me
Cause you're hot then you're cold
You're yes then you're no
You're in and you're out
You're up and you're down
You're wrong when it's right
It's black and it's white
We fight, we break up
We kiss, we make up
We used to be
Just like twins
So in sync
The same energy
Now's a dead battery
Used to laugh 'bout nothing
Now you're plain boring
I should know
That you're not gonna change