Found myself checking my husband's private messages and I regret it

So my husband and I've been married for 9 years, together for 14. Last year I discovered he was checking my phone and getting annoyed because there were men liking my pictures and commenting on them on fb and instagram. I didn't get why he cared because I wasn't in any sort of relationship with these people and they were just random men.<br><br>Then I found this app on his phone called cheaterbuster and he had been using it to check my phone. I confronted him and he said he feels insecure because these men were looking at my pictures and checking me out. He promised to never to do it again and I truly believed that.<br><br>Last week I noticed he was checking his messages and closing them before I could see them. I wasn't dumb, I found myself tempted to check his phone. I didn't want to, I didn't want to be that person. I wanted to trust him. But I got so anxious when those thoughts were taking over me and in the end I did it. I took his phone while he was in the bathroom and I used his chat to find out the girl's name in the cheater buster app to her Facebook account. I looked and she's an ex girlfriend that he cheated on with me. He said he would never contact her again and I found myself checking their chats and it was so gross, so gross I regret it, I regret it so much. I regret seeing it. I regret knowing. She found my profile and then she started sending me pictures and videos of them having sex and I felt so disgusted. I wanted those images to get out of my head. I wanted to erase knowing he was doing this. I wanted to forget. I wanted to pretend it never happened. I was in the bathroom crying when he came to me and hugged me and asked what was wrong and I couldn't tell him. I couldn't tell him I was checking his phone. I couldn't tell him that I snooped, I couldn't tell him I was crazy. I told him I've been feeling anxious and he said he was sorry and he hugged me and I felt so disgusted. I felt so disgusted at myself for looking, for snooping. I feel disgusted knowing that I did the same thing he did. I feel disgusted at myself for allowing it. I feel disgusting myself for not telling him. I want to tell him. I don't want to tell him. I don't know what to do, I'm so confused.