Sorry to hear about this Martin.
My parents got divorced 3 years ago after 30 years of marriage. My dad just left saying he was unhappy.
They were both pretty bad communicators, Dad didn't know how to talk about his feelings and Mum didn't know how to listen.
I would advise against forcing yourself to be a peace keeper if it at the expense of your own mental well-being.
As the oldest child I ended up taking on a lot of the family's emotional load. It was incredibly stressful seeing my Mum emotionally devastated and incredibly frustrating trying to get my Dad to explain his decision to me. He never really did.
Fast forward three years in, I genuinely think it was for the best. They are both happier and more fulfilled than they were when they were together. They are not on the best speaking terms but there is definitely less resentment. Time will make it easier.