My boyfriend's porn habit

[Easygoing]

A few months ago I found out that my boyfriend was using a tumblr account to look at porn. I told him that it made me feel inadequate and wonder if I wasn't enough for him, sexually. I also told him that it worries me, because it could lead to desiring something that isn't me. He told me he completely understood and deleted the tumblr. However, he doesn't know that I know the URL to his page, and I sometimes check it and notice that the number of porn blogs he's following has always increased. We recently got into a terrible argument. It was so bad that he stayed home from work to "decompress". I discovered that while I was at work, on the verge of an emotional breakdown, he was at home adding to his porn collection. It bothers me more that I told him how it made me feel, and he continues to do it. Should I address this issue? Or, do I let him have this one?