It's a tough one, my parents stayed together for me and my brother until I was 16 him 14.
We literally had no idea – they did a pretty good job of hiding it, I guessed though about 6 months before they dropped the bomb. Having figured it out I was fine, my brother not so. I always feel like they did a good thing for us but as the years have gone on, I've started to remember and interpret things and realised perhaps not. I've always got on great with my Dad, I had a pretty crap relationship with my Mum (she was miserable all the time and I was a royal PITA). Once they'd split though (we stayed with Dad as Mum couldn't really afford to have us anyway) my Mum changed dramatically, and I kind of realise now how bad for her it was that they stayed together for us. She was basically trapped, and hiding the truth all those years resulted in me thinking she was just a cow all the time. So now I kinda just feel a bit guilty now…
For the record, they were amazing on my wedding day, they hadn't spoke in something like 7 years and were proper stars!
Wow, never shared that on the internets before…
I guess I haven't helped but maybe hearing it from the child's side might help? I'm just shy of 27 now btw…