I just found out my father - who I looked up to as a great man - has cheated multiple times on my mom and has given her an STI. How do I handle this?

I’ve always had an idealized vision of my father - a good man, honorable, hard working, etc. I now feel like it’s all based on a lie. And he’s in fact a cheated, socially a loser, a coward etc.
I just found out my father - who I looked up to as a great man - has cheated multiple times on my mom and has given her an STI. How do I handle this?
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