Who are you???

Somehow
Only you will forget me
But somehow
Only you will remember me

Sometime
You are a disgusting demon
But sometime
You are the one and only angel in my life

Sometime somehow
You are slicing my heart and tearing my soul
But somehow sometime
You are the only one who is able to cure my heart and relieve my soul

Who are you?
Why torturing me like this?
What have I done?

Sometime
I would plead that you will leave once and for all
But sometime
I wish and pray with all heart that we shall be walking together till the dawn breaks the dark

What should I do?
Who are you?