Well find the food the two of them will be eating, and one word: Laxatives.

so you're upset that it was THAT woman? shouldn't you be more worried that he was not faithful to you? ydi

I wouldn't do it. just talk to your boss about it.

OP, at first I thought maybe YLS, but then I realized that he got engaged to a woman you hate. That is not a spur of the moment thing, so they had been dating a while. You are not upset that he was dating her while dating you. To me, it sounds like he broke up with you a long time ago and you have been stalking him ever since.

OMG u guys, obviously the OP is a dude

Ummmm obviously you guys weren't dating.

they're rather childish. guess his fiance sees you as a real threat, otherwise she wouldn't have gone out of her way to force you to watch their wedding. just go there and do your job and act like you're not bothered. she'll regret trying to harass you and you won't even have a guilty conscience because you'll have done nothing wrong.

That's extemely childish. I agree with #181; she sees you as a threat. Act like you're not bothered and she'll feel like an idiot. :O)

I'd do it so that I could **** up the whole affair.

how do you go out with a guy for 3 years and not know he's dating someone else? :p