Why is it so hard to say goodbye?

"I can't do this anymore"
Is what I told myself over and over again after my expectation throws me down

Who am I kidding,
Thinking that I'm someone special for you

Who am I kidding,
Getting all excited that I'm someone that you tell your news to

Who am I kidding,
Thinking that maybe I had a shot with you

When in reality,
I know

I know that you love someone else
I know that you just see me as a friend
I know that I'm just another additional person in your life

Who am I kidding,
Thinking that we do belong together.