I was seeing this guy about a year ago and we ended things because I had suspicions I wasn't the only one he was seeing despite him insisting this wasn't the case. Very shortly after (like less than a week), he started seeing someone (what a coincidence!) and within 6 months of when we had ended our relationship they became engaged. As we know many common people, their wedding website eventually got forwarded to me and after reading "their story", I learned that we have CONSIDERABLE overlap (ie: we were defintiely seeing him at the same time). I am comforted somewhat that I made the right decision trusting my instincts, but now this girl is about to marry a cheating scumbag - who, just three months before his engagement, contacted me to "hook up" (clearly, he was refused). I feel it is none of my business, but at the same time, feel like she should know.

What a tough situation to be in. on one hand you want to warn this woman that her fiancé has the potential to be unfaithful but on the other hand you want to stay out of it. Do you and this girl have a mutual friend or anything that you could ask for their opinion?

I say stay out of it. Seems like you did the right thing by your own self in ending the relationship. If you told her, she may be the kind that won't believe it anyway. But she'll always remember that you tried to 'break them up', so to say.

Amlexchar3 is right. What if she thinks you're just trying to break them up? Unfortunately, maybe it's time she learn the hard way.

While I believe in minding your own business, as you never know the circumstances of a couple, but an anonymous note is the best I can advise.

Agree do the note thing

The bride can't walk into a marriage like this

You will save her a lot of time and hurt

Regards

I agree as well- send a anonymous note and let the bride know- it will only be a matter of time that she will find out, and so might as well let her know before she marrys him

The correct thing to do is stay out of it.. It's not your place to confront the engaged couple.. The truth ALWAYS comes out eventually. So it won't be long before Karma catches up with him..

I can totally understand how refreshing it would feel to reveal his dirty little secrets esp given the fact that if you hadn't broken up with him its possible that they'd never have gotten engaged, but restrain yourself.. You telling all will also make you look a little jealous of the place they are in their lives now..
The couple might brush your "advice" off as a jealous ex-girlfriend trying to come between his happiness now. Even though I know that is not the case at all, I'm letting you know how it will appear... In the end his cheating will do one of 3 things..
1. It will come out and he will be embarresed and possibly dumped.
2. It will end and maybe she is the one he truly is meant to be with.
Or
3. It will continue with a new girl as soon as he says "I DO"

Your done with him.. Good for you.. Move on and forget all about this sleaze!