I had fun at a wedding recently. My most hated ex sent me a nasty letter to break up with me, and said some of the most horrible things anyone has ever said to me. He sent it while I was on vacation too. Luckily I had decided over vacation that he was worthless, but didn't want to even waste the money on a long-distance phone call to dump him.
My ex was at a wedding of a mutual friend who he has tried to get with FOREVER. We hadn't seen each other since the break up 5 years ago, so I didn't even bother speaking to him. Instead, I had a great time with the few people that I knew there. I looked good, was having fun, and he knew it. He was there by himself, had just gotten dumped by his fiancee, and had to hear from others about how I had a great job, boyfriend, and life.
He ended up leaving because he was having such a miserable time watching me have a good time.