My mother is cheating on my dad?

I found out like a weeks ago because I overheard a phone call and she was saying things like 'Don't worry the kids won't find out, my husband is on a work trip for 3 weeks, i miss you, yadada' and it should have been obvious to me but since she's my mom, i doubted it.
but then since i was suspicious i picked up the phone so i could listen to the call 2 other times and she's definitely cheating...
I don't want my parents to split up and I don't want to interfere with their lives but I can't just sit back and watch my dad get cheated on!!!
Also I can't even look at my mother in the eye anymore. I have so much hatred for her now
My mother is cheating on my dad?
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