And it’s the not knowing that bothers me
But you can't ever know anything about him 100% you either have to trust him or get over it.
I looked at other male friends and even families pages to see who they follow and it’s shocking how many people follow these pages. I hate modern day society
So it isn't just about him is it? You hate that friends and family members, follow people they finds visually appealing on an app that is all about visually appealing photos?
And this makes you hate modern society.
When, exactly, do you think people in society didn't enjoy looking at people they found attractive.
When in history has voyeurism hasn't been a thing?
People have cheated for as long as there have been relationships.
I think the porn isn't your issue, as such. I think you issue is a much wider problem, with insecurity in yourself. And that the Internet, social media etc is impacting your mental health.