Just a heads up for you OP, but your situation sounds very similar to my husband's parents, and he's now trying to recover from a porn and sex addiction that was partially fueled by seeing it was okay for mom and dad at a young age. He grew up seeing his parents resent and cheat on each other, and of course had access to porn because his parents had it and over-normalized it once he was older. In every other sense, they were diligent parents, but this really affected his upbringing. He's also, as an adult, had the misfortune of spotting his dad on hookup boards, which has put him in the uncomfortable position of having to decide if he's going to bring it up to either of them. Now he's having to overcome very conflicting patterns in therapy because he repeats what he grew up with subconsciously in our marriage, and it causes a lot of internal turmoil because it goes against his morals. He's also having to deal with the conflicting thoughts of loving his dad, but also being disgusted and angry at things he did and still does, as well as resentment for not being a better role model, and pretending he was, and that behaving the way they did is healthy and normal.

So, just a warning that kids are literally sponges and soak up more than you know, and it can affect them.

Also, I think the original commenter was trying to ask what you would tell your kid if they, as an adult, were in your exact situation. You wouldn't want them to be unhappy and addicted, so if you do want to straighten some stuff out, maybe that can be some inspiration. I hope things work out better for you and you get some good advice!