Lubeboy

So here's the story, an old buddy that I have known since 2nd grade is getting married to this chick he met while playing at a bar. She's totally not the type of girl you would think he would go for. She's a bit beastly if you know what I mean. His last girlfriend was a lot cuter and attractive. She also has two kids. My friend seems really happy with her. I guess that's all that matters right? After he started dating her he basically stopped talking to me or would take forever to return my phone calls or not even bothering. So I was like whatever and stopped calling him. It wasn't worth my time to care anymore.

Fast forward few years later he invites me to his wedding. It's taking place sometime next year in some remote country near Italy. It seems like a total pain in the ass to get to. Anyway I would be more excited but I think he's making a mistake marrying this girl. He's going to wake up one day and be like WTF did I get myself into. Then I realized that I don't really want to go.

I decided to give her chance. I finally got to meet his fiance last night since we live in different states. They decided to come up for a show and visit. She seemed nice but was totally flakey with me when I tried to strike a conversation with her every time. She also seemed like a total gold digger expecting him to pay for everything. This encounter re-affirmed my intuition that he shouldn't marry her. Sealed my decision to not want to go to their wedding.

So question is, how do I tell him I don't want to attend their wedding?