Seeking Advice About My Parents' Marriage

Assalamu Alaikum, I need some advice regarding my parents' marriage. They have been married for over 40 years. My sibling and I are both married to our spouses and live our own lives in our 30s. About 10 years ago, I caught my father, who was around 60 then, in a very difficult situation with our housemaid. It broke my heart and shook my whole world because I respect and love him so much. I didn't tell my mother or anyone else because I wanted to protect my family. Carrying that burden alone was very hard and affected my mental health. After that, we found out he was communicating with other women secretly, meeting them, and giving expensive gifts. He never admitted anything or stopped. He caused my mother a lot of pain emotionally, financially, and sometimes even physically. He is a difficult husband but, strangely, he has always been a good father to us, providing for us without complaints. It’s confusing how someone can have so many sides. Recently, I saw a post where he showed two hands with diamond rings on the ring fingers-one hand is his, the other is not my mother’s. He has never told us if he married someone else, and no woman has contacted us about this. Should I ask him about it? He is 71, and my mother is 65. Divorce is not really an option at this stage. Should I just leave things as they are? What do you think I should do? No matter how much I struggle with my father’s actions, I can’t hate him. He has hurt my mother deeply but has always supported me and loved me unconditionally. It’s really hard for me to accept the betrayal he caused my mother. I don’t want to go through that pain again by getting involved, but I would appreciate your thoughts. JazakAllahu Khairan.