And I think you have to play the long game ! The end is not yet known. Pretty much what I was going to say.
My ex had an affair with a supposedly mutual friend, I threw him out upon acquiring enough evidence inc a "straw that broke the camels back event" then had to deal with him a couple weeks later revealing she was pregnant.
A couple years later (he deliberately dragged his heels on the divorce but told OW it was me doing so to avoid remarrying) but the point at which they were engaged and excitedly planning the wedding and dd was all excited about being a bridesmaid was tough! And why wouldn't it be? Perfectly natural to feel the hurt and betrayal again and yes to feel it's unfair that apparently bad behaviour is being rewarded...
...then I discovered he'd cheated on her with a childhood friend the MONTH after they got engaged, she had banned him from having a smart phone or social media accounts except joint ones with her - yep they had a joint facebook account which as I was still in touch with him this way I thought odd and had never known such a thing and asked another mutual friend why that had happened which is how I was told about the post engagement cheating.
And then...he propositioned ME the night before THEIR wedding!
So don't make the mistake of believing their PR.
I was in the "fortunate" position of my ex, ow and I all being part of a community where everyone knows everything and nothing stays secret for long but my ex also being not the brightest forgot that! Or at least forgot I was still connected to that community!
Over the passing years I have learned, mostly without any enquiry from myself but shared sm stuff and people commenting, that my ex and now wife 2 are both - despite claiming otherwise to me of course - completely miserable in their relationship! But neither will leave the other they both feel trapped for a variety of reasons - karma exists, sometimes it just takes a while to get its act together!
Children grow up to be adults who can see what is true and what is an illusion
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Also true! At the time of my exes wedding dd was totally wrapped up in the "princess" phase of her own childhood and loved being involved in the wedding (and I have to say aside from the affair my former friend is a pretty decent person and has always treated dd well, better than dds dad does actually!) but as time has gone on not only has dds relationship with her dad completely deteriorated due to his inaction and lack of concern for her, but as she's grown and matured she understands better and appreciates how tough it was for me as a single mum and how I am the one that's always been there for her and shared all the good and bad times and supported her and been the one to make sacrifices to endure she had all she needed.
At one point in dds early high school stage her dad pulled the "I pay loads of money to your mum for you" crap and while I had until then endeavoured to protect dd from what a shit dad he was it led to some difficult and honest conversations a bit his lack of commitment and his not taking responsibility for his role as a father. Not just in relation to money, though that started the discussion (she'd asked for an expensive gift for Christmas there was no way I could afford and so I had said to ask her dad if he could possibly manage it. He took umbrage at being asked and basically lost the temper with dd for even asking! I wouldn't have suggested asking if I'd known that would be his reaction, he'd previously said anything like that dd only had to ask) but it led in a roundabout way to dd finding out (somewhat by mistake as she saw a bank statement that showed a charge for train tickets, this got her curious and she looked at more) that I had been covering for him cocking up on arrangements for contact visits, gifts and other treats.
At that point she asked me to stop taking on making all the arrangements and to basically let him sink or swim by his own actions - and he sunk like a stone!
I also find it very satisfying to think of alllllll his bad habits that I very much DON'T miss that she is now putting up with (and I hear he's added another 100 or so 😂)
In my case that's his excessive sweating, loud snoring, laziness, selfishness, obsession with bloody rugby (and every other sodding sport but the rugby is especially bad!), financial ignorance, inability to accept he's wrong, complete disinterest in babies (the man has 6 kids and has never changed a dirty nappy!), his eating loudly with his mouth wide open ALWAYS and at a rate of knots so that there were times he'd completely finished a meal and was demanding pud before I was even organised enough to sit and eat my own meal, his stinky sports kit that he leaves festering up to weeks before it occurs to him it needs to be removed from the bag and at very least put in the laundry hamper, his belief that if he uses a glass for a drink of water it doesn't need washed!, his seemingly complete inability to put something back where he got it from... You get the idea, and I'm sure your ex also has many gross and annoying habits.
As I said - don't believe their "roses around the cottage fairytale" bollocks PR - the reality is likely to be very different!