Reply to stbx, how about: "I'm so happy I can barely contain myself, in fact, I gotta go- thanks for asking. laters."
You want to reply because you feel it's rude or because you want to somehow tell him how you feel? If it's the latter then don't reply. If it's the former reply with what wii said. Something short and sweet.
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again