What do I do?

So I was looking through my boyfriends phone last night because I’ve had this feeling in my gut and I came across a bunch of pictures he screenshotted of a girl on Instagram and a while bunch of naked porn stars... I am very distraught and very hurt by this situation and idk how to feel about it or even mention anything to him about it...help...it makes me feel like I’m not good enough for him so he has to have other girls to soothe his needs and help him get what he needs. Honestly it hurts.