Who am I ?

Tell me Where I exist,
Or Who am I,
I lie in your smile,
Or walk in your cry?
Don't ask me for wishes,
Or frame me in your heart,
Dark truth I am,
or an endless lie.
Don't think of my face,
for there isn't any.
Of wet eyelids,
Or a never ending joy.
Don't call me in blues,
I may not answer,
Of eyes deep red,
Or heart dead dry.
Don't walk in my arms,
or a kiss in the dark,
A trap it could be,
or a vicious ploy.
Don't search me in mist,
or down your memories,
I am wind,will be gone,
with the blink of your eye.
Tell me Where I exist,
Or Who am I ?