I clicked over the The Knot today, and it kindly suggested that
"Since you and Lucas are already married, why don't you go check out The Nest?"
Ummm... No thanks, Knot. And thanks for bringing up my ex, because that's always fun.
So I clicked on "My Account" and I erased XH's name from the "Sig other" name fields and hit "Update." When the page reloaded, it said my changes were saved, but his name was back. This happens over and over.
What is the trick to getting The Nest to acknowledge that I have no significant other?
ETA - Apparently I can change his name; I just can't clear it. So now my significant other is "Fu?k you, Nest! I enjoy being single."

Re: How to get The Nest to forget about XH???
That's okay. "Fu?k you, Nest!" and I are going to live happily ever after. In fact, our wedding is scheduled for October 26, 2012* since I couldn't clear my wedding year either.
*The day I'm eligible to file my divorce application.
I wanted to look at wedding dresses on the Knot when we were doing a PIP so I made up a fake wedding date in January 2011 (because it made me). Now I keep getting things about my anniversary, etc. It's annoying but I'm too lazy to figure out how to delete it.
Ugh. Idiocy, I tell you.
BTW: does anyone know how to change/remove the location on a nest profile? I cannot figure out how to do this for the life of me.
The only way I've heard about doing it is by letting a mod know and the mod contacts the nest gods to change it.