Separation

I always enjoy reading poetry centered around the theme of love-lost and the disapointment that lingers long after.   I think you conveyed your emotions well. 

The word "bitter" just before dusk, could be changed to some other descriptive/verb more fitting.  A word that conveys a masking of the sunset or a consuming of it maybe.   Or take out dust and replace it with another noun:  I know the dragging haze of love

What is Uz?