Same thing here I am a child of divorce. My mother married a divorced man. So I saw both sides.
On my mother & bio-father's side, while they fought a lot after they divorced, they never did so in front of us. And woe betide the child who tried to insult the other parent or play them off against each other. They had their differences, but they never allowed us to be in the middle.
My step-father's ex did everything she could do, to poison the relationship between him and his children. She sued him often over trivia. She contacted his command (military) and lied to them about him. She waited until he was at the front door to pickup the children and then would grab them, push them back into the house, and demand more money before he could see them. It was truly horrifying.
I know all of this because I found their hidden stash of legal paperwork and I read it all and continued to read it as the years went by, while I was living with them.
If there is any way that you can get the three of you into family or parenting counciling, I would highly recommend it. You can see the differences between our two "families" to this day. His kids are a mess, to put it nicely.
And I was 13 when I was told about my parent's divorce. They sat us down, and told us that they were not able to live together, that they both loved us, and that they would always love us no matter what. Yeah, it was painful. But they over and over told us that it wasn't our fault, they loved us, and they would always love us.