It's rude to leave your fiancee at the altar.
Mark has second thoughts about marrying his fiance Tiffany.
Mark wants to break off the wedding.
Before the wedding, Mark tells Tiffany that he's not ready to get married.
Mark doesn't show up to the wedding and leaves Tiffany a break up letter.
Tiffany is sad, but appreciates that Mark told her before the wedding.
Tiffany becomes angry and frustrated at Mark for being so cruel.