My parents' marriage is a big failure. My mother is very narcissistic and materialistic, and she is constantly abusing my father (who is about 15 years older than she is) physically and verbally, draining him of all his financial resources and treating him as her personal servant. Despite this my father constantly defends my mother like a simp, telling us what a great mother she is and that we should love her.

A few months ago I found my father fast asleep with porn playing on his phone. It was disgusting but I didn't say anything about it because I understand that his sexual needs probably haven't been met in 20 years.

And then very recently I found out that my mother is highly likely cheating on my father -- on multiple occasions I saw a man sneaking in and out of my mother's bedroom and our house, and her trying to hide it from my view... among other things that have raised my suspicions.

I... just find all these so sad, ridiculous and laughable.

Well, my question is, what would you do in this situation? Would you stay out of it? Would you tell?

My current opinion is that since it is not my marriage or relationship, I don't really care what they do about it. Furthermore, they are more than 25 and 40 years older than I am, so they are more than old enough to make their own (poor) decisions. Honestly, I am just so used to my parents' marriage being such a big failure that all I can do is not take these things too seriously.

What are your thoughts?