This Little Emotion Just Toying Around

Why does this happen?
Why do you care?
Do you expect me to know?
This is all unfair.
I wish I could say,
I get it anyway.
But I can't-
I guess this is over.
I guess you can't stay.
But I never expected you to,
Really,
It's true.
I knew this would happen.
And yes, unfortunately,
That was a lie. 
I thought you were the one.
But I'm always wrong.
So why does this happen?
And why should I care?
I guess it's this thing.
This emotion just toying,
Fooling around with me.