My moms cheating?

My mom is cheating on my dad, not physically (yet) but verbally on Facebook messenger. It started out friends because they had a surgery in common and now it's turning into something serious. The other guy is talking about "getting the other guy (my dad, you asshole!!!) out of the picture so they can be together" and I just don't know what to do, I've been crying for a few days straight at how unfaithful my mom is being. I don't know how to bring it up, she has a password set on her iPad but she didn't realize that I'm not as stupid as she thinks and I watched her type it in so I could read the messages because right from the start I knew the guy couldn't be trusted! My gut screamed it! So what do I do? How do I tell her how I feel when really I shouldn't have even known because how did I know the password?
My moms cheating?
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