Is AUTHOR wrong in the post ? POST : Mobile so pls excuse my formatting.

I strongly believe my boyfriend is addicted to porn. He has thousands of pictures of hentai in his gallery and always has at least 20 pornhub, brazzers, or other porn tabs open on his phone for him to come back to. Sometimes he saves porn he finds aesthetically pleasing or well drawn, with no intention to get off to it. 

While this is all fine, maybe a little out of the ordinary, it puts me over the line when he uses porn during sex with me. At first he claimed it was just derogatory to me, which he finds hot and I did too until we tried having sex without it and he was unable to climax. About 70% of the time we have any form of intercourse (blowjob, handjob, or even actual sex) he uses porn to get off.

I'm an extremely anxious overthinker and I've started to believe it's just because I'm doing something wrong or I'm not physically attractive enough for him to be able to have sex with me and get off. It's getting to the point where I catch myself thinking that it's normal and every couple experiences this, but I have never experienced it in any of my past relationships. While I respect his right to use porn to masturbate to when I'm not around it has started making me feel really insecure so I just confronted him about it over text. I told him how insecure it was making me and if he could just try to lay off the porn a little. He mostly shrugged it off and didn't seem very concerned about it. I got more serious and told him he needed to be more mature about this discussion and at that point he just stopped responding. 

He has continued to download more porn and has made no visible effort to change his behavior since our one-sided conversation, even though it has caused me to break down into tears several times. He says I'm just being silly and overreacting and it's not that big of a deal. 

Am I missing something? Am I approaching this the wrong way? AITA?