I just found out that my father is cheating on my mother but she does not know that. What the heck should I do?

I am 20 years old dude, found some messages on ipad's screen that someone is making love with my father,( yes I am sure that he has someone) but I have no clue what should I do? If my mom finds out they gonna divorce, I dont want that to happen they are together more than 25 years. And if I dont act and my mom finds out, will it be my fault that I did not do anything? It is kind of weird to me to talk to my father to stop doing whatever he is doing? Pls help good advices
I just found out that my father is cheating on my mother but she does not know that. What the heck should I do?
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