I feel lost

right I need some help just a a lil back story I'm 17 and he is almost 19 we have been together 2 years. I went though his phone the other week ( I know I shouldn't but I did) and I found he has send loads of lasses his dick picks (the same ones he sends to me 😔) and I then saw he was doing some questionable stuff on his redit like taking to girls to meet up for dogging and sex and letting them call him daddy etc. now when I confronted him he tried to turn it round on me saying I shouldn't have looked and I'm a bad girlfriend. I just don't know what to do becuase I love him but I feel so lost 😔💔