Confused and upset

Yesterday I found pictures of naked women on my husband’s phone. We were in the car and I was trying to help him get his music to connect to my car while he was driving. He doesn’t keep his phone locked and I generally don’t mess with it. But while trying to get the music to play I accidentally hit the photo app. I’m not use to his phone and it didn’t say it was photos. And before I backed out of the app I saw a woman laying down and her breasts were showing. I asked him why there was a naked woman on his phone and he responded that he looks them up on the not safe for work area on funnyjunk and such. I asked why and he said he just does and did I want him to delete it and I said no but why didn’t he tell me. I’m pretty chill with things but I feel heartbroken that he didn’t feel comfortable enough to tell me. I’ve barely spoken to him since yesterday and I can’t think about it without crying. We’ve been married for almost 3 years and together for 7. I was told by a friend that her husband has a folder on their computer for naked women and that it’s normal and I’m just like WTF?!