Both my parents had affairs. My dad, multiple. I found out about one, aged 7, and told my mum. Aged 9, my mum had an affair and left my dad for him.
Ultimately, I blamed my dad for it all. My mum was desperately unhappy because of my dad. She used the affair as a means of escape. She felt unable to leave alone. Low self esteem I'd imagine.
My dad's behaviour following this was terrible. He went on to start a relationship with one of my mum's colleagues. This might be outing... but my mum was a teacher, and she taught at my primary school. As a result, my mum had to leave the school, because she could not tolerate working in such a toxic environment. The result was, I also had to move schools. We lived 30 mins from the school, so it was unfeasible to go there, and then my mum go to work even further away.
Moving schools in year 5 was devastating for me. Prior to that, I was such a happy child. Even after the divorce. It was only once I had to move schools 8 months later, leave all my friends behind and start again that my life changed for the worse.
I never made new friends. Drifted through the rest of primary unahppy. Went to high school with the kids from the new primary, and still never made friends. Ended up leaving school pregnant and like no one thought I was worthy of friendship, so may as well have a baby to "love".
16 years later, my life is totally turned around. But I still blame my dad for the way he treated my mum, and what he did after they separated. His actions potentially shaped the rest of my childhood, and how my life has turned out now.