Only the best i ever had

You ask why i'm so blue
You ask why i'm so sad
Is it not that hard to see?
That you're only the best I ever had

I thought that I could count on you
I thought that you were reliable
But gawd darn
I guess its just because you undeniable

i don't quite get this
Why you're forgone
I just know that i'm so so sad
When you're gone

I guess I should just give up
And say good-bye
And try to remember
That big girls don't cry