((((Hugs))))) Sorry you are dealing with this. I agree with Crazy Hitch that him possibly becoming a sex offender is an entirely different animal all by itself. That's anxiety running away....

If he is swapping naked/dirty pics with women and he is chatting dirty online, that is a form of cheating, imo, and is just as real as if it were in person.

Many men look at porn, even while in a relationship, and many would say that is perfectly normal. I personally do not want that in my own relationships, so I steer clear of men who watch it, which narrows down my dating pool to a few. My current boyfriend hates porn, and I love him for that, and I know he feels the same exact way as me about it.

I digress.... the main point is about you, your relationship, how you feel about it all, the anxieties you now face and the mistrust you feel. His behavior when younger shows a bit of voyeurism or perhaps fetishness (?), stepping out of the norm, and would be a bit concerning to me given his present behavior.

I wouldn't trust him either and probably would break it off if I found out my guy was sending naked pics to women and on a sex chat site. I wouldn't want to live with the constant mistrust, which may never go away, or the anxiety about what else he may do.

But that's just me. It's a long-term relationship, and therefore, probably will take much thought and consideration given your history and length of time together. I hope you can come to some peace and resolution about this, either way. (((((Hugs)))))