Fiancé looking at porn

So my fiancé and I live together, we have a very healthy sex life. We usually have sex 4-5 times per week and are very affectionate otherwise. Just very in love all the time. He’s always telling me how perfect I am and how beautiful I am and how attracted to me he is, etc. He’s told me on multiple occasions that he doesn’t even look at other women ever.
Well the other day we were out with friends and I left my phone at home. We were all debating something so he gave me his phone to look it up. When I went to open a new window I could see all the websites he had open and they were all porn sites. I was just in absolute shock. Not necessarily mad but pretty disappointed and hurt wondering if he’s been just feeding me bullshit all this time of he really is interested in looking at other women. Our intimacy is so important to both of us and I kinda feel like it’s been broken. Thoughts?