Cause you're hot then you're cold

You're yes then you're no
You're in then you're out
You're up then 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
You don't really want to stay, no
But you don't really want to go.
And I don't wanna let go, too.
Cause I just cant bear to, give up all these.
You said that I know you the best,
it's my best assurance.