How do I deal with finding out my boyfriend watches really aggressive porn?

I (f20) have been dating my boyfriend (m21) for nearly a year now and during this time our relationship has been mostly stable with a few petty arguments but nothing serious. This morning however I got the sudden urge to check his phone while he was in the shower. Just out of curiosity not that I was suspicious of him cheating or anything. I open his Reddit and find he follows multiple nsfw subreddits which are mostly all r*pe fantasy (things like seeing women as objects). Although I know he likes to be dominant in the bedroom it’s concerning to me that he objectifies women to this point especially since he always compliments me on how submissive I am and he’s so lucky he found a submissive women like me. I’m just wondering if that’s the only reason he’s with me now since our relationship has always been sexual from the start. I know it’s normal for guys to watch porn but I thought he was different and I just feel so hurt by it.