text: It's simple. Show up wearing something absolutely stunning. Sit through the boring service then at the reception have a drink, laugh with your mutual friends and make it clear your over it. Bringing a date is a great move. If you're asked for a speech make sure you're funny but also take the opportunity to dish some dirt. Also be sure you leave early before the bride and groom do. You wanna cut your ties so make sure you get things out of your system, and show him that he's giving you up for good and show him what he's missing before you go!