I'm early 30s, my parents separated when I was around 11.
There were a number of issues but cheating was one of them (no abuse or violence though).
I'm not angry that they got divorced.
But I'm angry with the way they acted during and after. And actually with the parent that was cheated on more so!
As a child I was told everything, every single detail. All the details about the affair, everything said parents thought about each other, I wasn't allowed to discuss what I was doing with one with the other to the point if, for example, one parent had told me something or taken me somewhere and I wanted to talk about it to the other, I'd make up that I'd been with someone else because I was scared of bringing them up even just mentioning their name.
In every other way they were good parents. But I'm still so angry about this. Things have definitely calmer down now and are better between them but I harbour so much bitterness about this.