As a Sponsor / Petitioner of an I-129F Petition for Alien Fiancee, what should I do if I have a change of heart?

According to U.S. Immigration a non related rule rather an adequate, is for the U.S. sponsor to contact the U.S. government agency that has his or her petition at the time of the change of heart? Your petition would start off at USCIS, later go to National Visa Center and essentially to the US Consulate of your alien fiancees country. Contacting them by email or letter requires having all of your correct credentials in order to identify that you really are the sponsor and a short letter explaining why you would like your petition to be terminated? By doing this it will insure you of being able to file for another foreign fiancee later on if so desired?