Hot and cold.

And you always think
Always speak cryptically
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

[Katy Perry, Hot N Cold]