Helpppp!

So I used my boyfriends phone to look up something and there was porn left up. Normally I Wouldn't care cause who doesn't watch porn? But what got me was the type of porn he was watching ... I'm actually embarrassed to even say what kind it was but it's definitely nothing we've ever talked about or something I ever knew he was into and we've known each other for 6 years and we've been dating for a year . I don't know what to do but I'm very bothered and a little weirded out. Any advice???