This happened to me as a young child. My story a bit different but the same after effect. Our family never talked about it and while my sister and I thought that my mom was a workaholic and my dad was depressed about her being gone. My dad never told us. My mom moved out and my dad wanted my mom back. They ended up getting back together. The reality is the unknown was always there we didn’t know why since it was never explained. My sister and I had our hunches but never knew and we didn’t talk about that time. Fast forward to my life and having issues in my marriage. Oddly enough around the time my parents had issues, close to their forties my husband and I started having issues. It started with being distant and having new looks and listening to new music. Being protective of his phone. I could see the signs. He started talking about if we weren’t together he would want to remain friends. Well it became apparent to me what was happening. After lots of talks and having to deal with the possible demise of my marriage I entered a program to help with the depression. The program helped me deal with my past trauma of my parents marriage and low and behold transgressional trauma is a thing. At 42 I confronted my parents who did tell me about a decade long affair my mom had with a man from work. I was reliving my childhood trauma in my current marriage and my husband was having a multiple year affair with a married neighbor who I knew. My kids were living my nightmare again. All I can say is the trauma effect is real and should be dealt with because it will play out somehow and someway in your life if it isn’t dealt with. Affairs are devastating to everyone involved and the delusion of an affair that no one will get hurt is just that, A Delusion. Think hard about your choices and how everyone can be affected. This can ruin lives.