Is it normal that my boyfriend likes porn so much?

I started out being okay with watching porn with my boyfriend. I was even open-minded enough to look at pictures of him and his ex engaged in intercourse and not flinch. I introduced to him one of his now-favorite sites for looking at people camming, even went as far as camming with him and posting erotic pics of us together. Soon our relationship became consumed by this porn fantasy world. Every day led to camming or looking at porn for hours and hours.

The camming became more and more extreme. I began to feel degraded because he was showing no respect for any of my boundaries. When he bit me in a sensitive area hard enough to cause tears, I turned the cam off and have never cammed with him again. It also came to the point where I got tired of looking at porn with him for hours and hours. We only interacted in this forum. I stopped watching it with him because I just began feeling disgusted by it all. It has left me confused since I didn't have a problem with porn before. I find myself wondering if I just don't cut it for him. Is it variety that he craves, and if so how could I ever expect him to last in a long-term relationship with just one person? I don't want to force him to be someone he's not and I suspect he will never give up his porn? I tried talking to him about it and how much of a probelm it has become for me, so now he is simply more active in hiding it from me. I read that enjoying porn is normal for guys and that girls should try participating with their partners, which I did. What now? Is this REALLY normal???