Snooped, and regret...

So, heres a little background info before I ask my question. I'm 21 years old and hes 31, we met at work and been together for almost a year now. I always get a sick feeling in my gut when I feel that something isn't right in my relationship. I mean hes nice to me and all, but everything started to feel off when he told me that he found one of my friends at work attractive. So I'm at home by myself today, he gets off work in a hour or so. I decide to look at his tablet history, I've NEVER done this with anybody I've been with in the past, I just had a feeling something was off...I know still a bad Idea and I regret doing it. First I found results for nude snapchat pics, nude teen girls (sick...), googled/facebook his ex gf, meetme, and okcupid. This was last months search history, as if I didn't feel awful about myself already. What should I do? I want to confront him, but thats the thing about snooping is that he'll know. And I know guys have to look at porn whatever...but nude snapchat and teen girls really???? I feel so sick I don't know what to do.

have a chat with him. its important to tell him how u feel