I hate my friends fiance! how to i get out of being in the wedding or going to it?

I introduced a friend of mine to a coworker, partly because i don't date girls I work with and she kept trying to hang out with me and partly because I figured they would get along. Now shes managed to alienate m and some of his other closest friends, some that hes known for 8+ years they've been together less than a year. I'm suppose to be a groomsman but i don't want to support something I don't believe is good. I regret ever introducing them, his family doesn't even really like her. So how do I avoid the whole wedding situation?