"Your friend died, they did not tell you; they merely left a sign up for anyone to see and read, assuming everyone already knew?"

Rabastan may be thinking that there are some parties involved who need a Talking To about making sure that those who are friends with the newly-deceased know about the dying of the person involved.

Anyways, he's not too chuffed about Mia being kept in the dark.

Mia, he reasons, is pregnant, not fragile. She can handle the telling.