Now I know people have there opinions with there S/O watching porn, but here's my question : when is watching to much porn considered a addiction?

Not going into to much detail, but recently I found out my S/O was hiding his porn "addiction" as he calls it and he's spending at minimum $60 a month on subscriptions. I confronted him after I seen a few emails in his account.

Now I don't mind if he watches occasionally, but he's confessed he's always been to embarrassed to tell me because it's a addiction he has had most of his life, it's a stress reliever to watch hard core porn, hazing porn ext.

Now where I draw the line is any interactive porn like live Web cams ext. Now I'm finding out for the first year of our marriage and prior to our marriage he was on a live Web Cam not interacting but then I dug more and found a Second account where every few days he was spending $40 - $70 on coins on a live Web Cam site to make these girls vibrators work. To me interactive porn is 100% cheating because your telling them live what you want and on this other site your making there vibrators work to make them cum as your getting off....

I am extremely Hurt by this. But I still don't really understand the whole porn addiction concept....

Any insight or experience in this area would be really appreciated! I'm so confused and trying to understand about "porn addiction" but I just don't fully get it.