How is sexing and porn the same?

He got caught sexing pictures, videos tryna meet up Ect. I kicked him out and he is begging to stay but give me my space, btw this is my apt, oh & he also emotionally cheated 2 years ago, which we did break up over but with a child involved a second change was a pass. Now hes telling me its a problem he has not something he does "often" jus every "now and then" and refer to it as a porn thing WHAT THE FLYING FUCK these women were "strangers" on a text app which I find very fucken fishy..... I've also caught him on watching webcams. Is this an addiction to some kind of porn? Help me understand? Cheating is cheating but this is a whole new feeling it's like my chest is heavy my eyes want to cry but cant, these were STRANGERS would the feeling be different if it was someone I knew? Is this cheating too or plain disrespectful? One more thing we been together 10 years, this man, oh wait Scratch that boy!!! (30yrsold) persay. Turned out to be every douch bag story on glow.... how can I live with that? How can I put my boy thru this all once again? Hes old enough to remember all this. I'm heartbroken sad angry mad disgusted plain numb