I Don't Know Who You Think You Are

I don't know who you think you are
You mean nothing to me
You turned your back,when you had your fill
I suppose now you think your free.
One day,you will realise
That what you did was wrong
You'll grow old,you'll grow up
And you'll be left all alone.
Never shadow yourself beside me
No space for you is there
All who loved you will be gone
No-one left to care.
Yes,I feel hurt and I feel pain
But sorrow will never last
Because,you see my fickle love
You are already my past.