Worrying so much about porn!

Okay so I've been with my bf for over 3 years now. I would say about 1/2 year in I found out he watched porn. At first I did get super upset about it to the point where he told me he'd stop. 3 months later, I found out he never did but our sex life was great! I've always struggled with this concept, but my bf has told me time & time again that there is nothing to worry about because obviously he likes to do me better...he just needs porn as a visual. I do understand that you need porn as a visual, because I do that too, but idk why I still worry. I only see him Thursday nights - Sundays, so we really only have sex about 2-3 times a week. For the past 1-2 months he's barely masturbated to porn, but this week he's done it maybe 2 times when I'm not there. I guess you could say that I'm afraid that by him doing it more, it'll interfere with our sex life. He always tells me they're two different things & it doesn't affect how many times we do it...but idk 😔 I have all these worries in my head about this but at the same time know the answers...as none of my worries have come true for the past 2 1/2 years. I hate bugging my bf over this because it makes him frustrated...how do I deal?