Would you say something?

You need therapy, that’s the only thing that is going to give you closure. Nothing he is going to say is going to give you anything but more anger. You know the truth of the matter and it’s time to move on with your life free of it.

Everyone will know OP. I have a friend who had an affair and she posts on Facebook about the day she met her wonderful man every year, it’s all bollox, we all know they started shagging a good 18 months before that and there was a cross over.

No point in saying anything OP.

All he's going to say to the DC is "Whoops, X made a mistake in the speech" 🤷‍♂️

In the wise words of Queen Elsa "Let it go"

Exactly this. I am sorry he was such a scum bag.

He's clearly lied and you were right to ask him to leave. He probably would have done eventually. At least you and your kids know the truth even if he won't admit it himself. I get why you're annoyed with him. Me and my ex husband broke up 5yeara ago for a lot of reasons including trust issues. He was talking to other women and hopping on dating sites. He tried to say I was crazy and imagining things whenever I confronted him about it despite seeing a lot of evidence before we split. One day after we split like a long time after I came across an old phone of his tucked away in the back of a cupboard that I didn't really use. I plugged it in and pulled up his email that was saved on there. There were hundreds of emails dating as far back as before we even got married of him trying to meet women and even screenshots of transactions sending money to women for nudes and other stuff(sending £100s of pounds). I was annoyed especially as he made me out to be crazy and not thinking straight and then when I found the evidence I wanted him to own up and be truthful for once so asked him only for him to still insist he did nothing wrong. I was more annoyed that throughout most of the marriage he barely contributed a penny into our home and living expenses watching me struggle financially for ages all whilst he was spending it on women online to get access to their nudes and cameras. He still denies it now

Came to say the same thing.

How horrible for the speech giver/ your ex to do that to your children.

I can also understand your frustration OP.

If it helps, I've attended two weddings where the almost the exact same scenario has happened.
Both times I noticed the date discrepancies immediately and so did several other guests. Feelings were unanimous that it was selfish and thoughtless to include any of that stuff in speeches, and also completely unnecessary. There are so many different ways to do a wedding. If your beginning was also a hurtful ending for your children, then FFS maybe just don't bring it up!!

I have to say I now have a lower opinion of the groom in both instances. In one instance it really messed up relationships between the new wife and the groom's family.

It was twelve years ago. Move on.

You’re never going to get the answers you want from him. Nothing positive will come from bringing this up with him.

You know what he’s done and that’s what matters. He’s re married now, let him get on with his life and you get on with yours and focus on being the best co parent you can be with him for your children’s sake.

Bringing this topic up will only cause tension and arguments and effect your children

You already knew he was an arsehole cheating on you, now your kids do to. Leave it at that.

There's nothing to say. Everyone knows now. I doubt it was a huge surprise to anyone. You knew he was seeing her, hence telling him to go back to his gf. Now your kids know too.

It's time to move on. Your ex is not worth your energy or space in your brain.

What’s the point of saying anything now … this was all over 10 years ago, get over it and move on.

My parents divorced 25 years ago - I can't get a straight answer from either of them about what happened. It's a losing game. Your happiness is the best outcome.

Do you seriously think he would tell you the truth?

It sounds as though he wouldn’t know the truth if it slapped him in his face.

Tell your boys that the person giving the speech must have got the dates wrong (which they could have) and DH will say this anyway.

It doesn’t matter if he cheated on you or not.
You will always be the one that got away because you were strong enough to kick him out and I would hold on to that.

I think it’s amazing that you went to his wedding.
I’m not sure I would have done.

She might have a job "taking him to the cleaners" unless she has a very special DeLorean.

What on earth would you say after ten years that would make one iota of difference? Genuinely? It's a bit concerning that you would even ask whether or not to say anything. Of course you were deeply hurt and it is the worst when people lie to you - believe me, I have been there. But it was over a decade ago. I assume you weren't at the wedding and that your sons told you about the speech... have they also not let go of the way in which everything ended?

It was 11 years ago. Time to move on.

I’d happily report to mutual friends and family that it’s reassuring, after hearing so many years of lies and being made out to be the bad guy, that ex is now admitting he was a cheater and forced the situation, maligning you. Add how lucky you are to be away from that kind of behaviour.

This is a brilliant suggestion

He will reap what he sows with his children. He’s an idiot. They’ll see this eventually.

Well, he clearly had an affair op, not that it’s worth saying anything after all this time. He owes his kids an explanation I think, and that’s for him to deal with.

He is never going to admit to it OP
Enjoy your freedom and embrace your self identity

I wouldn't be able to help myself - I'd say something like "Interesting speech. Shame the kids had to find out you cheated that way."