Quoting Mommeee™:" I would ignore it and move on. She isn't trying to contact either one of you. Tell your friends to not bring her up or tell them to shut up about her because you don't/shouldn't care."
Quoting JiLLiAN.:" <blockquote><b>Quoting Devil's Advocate:</b>" Then tell them you dgaf....unless you ... [snip!] ... Right? I wish one of SOs exes missed him. It would be cute and make me feel like I have something even more special."