I Need Advice & Opinions!

So my husband knows how I feel about porn and him watching it. I know some people don't care about their significant others watching it, but I do, and he knows that. He's never been into it before, but, I was looking through his history and saw that he's watched it twice now on two different occasions. It especially bothers me 1) because I feel like I'm not good enough, and 2) because he's never really been in to having sex. I always crave it, he could take it or leave it. 
I need to know how I bring this up and let him know how upset I am about it, without letting on that I saw it in his history. 
Please help!!