<human>: Can you succinctly summarize the text in 1-3 sentences?

My mom has been cheating on my dad for a few years with a family friend. I think that she had started cheating on dad after he turned ill and became slightly depressed. I found out about her cheating through peeking at her texts as well as emails. An extra detail I should add just in case it changes anything is that my parents are religious.

At first I started to hate the person she was cheating with but then over time I realised that she was in the wrong as well. I've learnt to sort of just ignore it but from time to time his name comes up and I just feel torn on the inside.

Both my parents are good people that although might not acknowledge each other that much and sometimes get into fights, care for me a lot. I haven't been able to read any of her texts or emails since she has been very protective of them lately (such as making sure to log out of her email every time she uses it). However, from the last text I have read a while ago I think she is being clingy with the person she is cheating with whilst that person is trying to stay away because he knows that she has a family. 

Lately, I have been conflicted as to whether I should just let this continue as I already have or to act on it. I think acting on it would have large consequences as my dad is ill however letting it continue is tearing me up inside. I don't want anything bad to happen to either of them since its not like they're abusive or bad parents. I guess all I really want is a voice from outside to make sure I'm doing the right thing in staying out of it.
<bot>: Teen who's mom is cheating on his ill dad, both are good parents/people. Not sure how to act since every path brings about some consequence. Just looking for some support (especially from people who have the same experience).