Too much pornography will end my marriage

My husband (M35) and I (F35) are having many problems in our marriage. I am bothered by his sexual behavior. We have always been very active intimately, both together and separately, but recently I began to understand (and am still slowly understanding) aspects of his intimacy that have been bothering me. I will try to describe: he consumes a lot of pornography, since forever. I have always known about his collection of magazines with naked women, but I also realized that he has terabytes, gigabytes, and megabytes of content saved on external hard drives. He searches for adult content daily, actresses and regular women on different websites and on Reddit, saves these materials, and the next day, he downloads them for his own use. He masturbates in this process, several times a day, even during work hours. He knows the names of endless pornstars and is familiar with their lives in detail, as well as knowing many details about the lives of several actresses, singers, or models. I started avoiding watching any movies, shows, or TV near him because I begin to think, “He had fun watching that woman,” and it causes me a lot of suffering, shame, and emotional distance from him. I see women on TV and think he will look for her anywhere in the media to masturbate with her photo, just like I think a Grammy is coming up and he will look for pictures to download – these are behaviors he has. He even browses Reddit adult content while in an Uber or at the supermarket. I’ve tried talking to him, but he goes into defense mode, saying it’s a hobby, that it’s normal, and I disagree. I need help; I can’t live like this. I don’t think this is normal. There are more details that are not worth mentioning, but this is the general context.

tl;dr too much pornography will end my marriage