My best friend is getting married, and I'm her matron of honor. She already has her mind set on her bridal party until today... one of the groomsmen's current girlfriend asked who would be in the bridal party, and my best friend mentioned a girl who is the ex of this aforementioned groomsman. The current girlfriend made a big fuss to my BFF and mentioned that she will be telling her boyfriend about it, who is now making a big fuss about being in the same wedding party as his ex. My BFF really wants this girl to be in her bridal party, but she doesn't know how to handle the situation. Any advice?