They either don't understand why you are not pursuing her and trying to win her back or they are afraid they are going to piss her off and she will cut them out of her life like she has done with you. My MIL in the begining use to lay into my W until my W stopped calling her mother. My MIL started singing a different tune and was not so supportive of me anymore.
I think you are doing the right thing by not contacting them.
Formerly "missherlove"
Me49 XW49 M17 T19 S16 D20
Expose yourself to your deepest fear; after that, fear has no power, and the fear of freedom shrinks and vanishes. You are free.
