I'm so sorry...and I soooo know how you feel. I miss my nieces and nephews intensely, and no less after 2 years have passed. it's the "collateral damage" that can be the most painful, I guess.
and yeah...what could they all have been told, after knowing us--REALLY knowing us--for so long? they ought to know better, they ought to know US better....
I know you've been following my sitch, and in the past week there's been remarkable movement and grace--not with my nieces and nephews, but my former parents-in-law. and what I learned is that they've been i pain too, they have experienced loss. and they didn't know how to handle it, and they didn't know how to handle xH in all of that, and they want us to continue to be part of each others' lives--even without xH. and I think things will eventually normalize to some degree with former family members I've been closer to as well. things move slowly, there are shifts...and then many things happen at once.
I mention these things to offer you hope, as well as to empathize with just how much this hurts.
((((gardener))))
M60 H52 D20 M14 yrs OW-old gf from 1986 bomb-5/18/08 H filed for D-9/10/08 D final 4/24/09 xH remarried (not OW) 2012