Some of them did. I think it makes it too real for some people, that this could happen to them, just as easily and unexpectedly as it did to me, and that scares them. My divorce is the elephant in the room, and it's easier not to be in the room at all than to be in the room with the elephant, kwim?
I have other friends who have been great friends to me, even through my divorce and into my life as a single mother. I think they are secure enough not to be threatened by the reality of my situation and the possibilities it might bring into harsh light for them. Really, truly, I think the issue that some of my "friends" have is solely their own, and has not much to do with me at all, so I let it go ... and sometimes, I let those friends go, as well, because I need people in my life with whom I can be mutually beneficial.