Life of a step parent ..

So, it’s been a long night. Last night I was going through my boyfriends iPad because his daughter has had it and I like the try and monitor what she does since she is 11 and as I was going through deleted photos the first thing I come across if a picture of a penis. I immediately show this is to my bf and he just kind of sit there and to be it’s like he is brushing it off. I’ve been so patient with the way he parents her, even though as times it’s not the best and this just makes me mad. So we end up getting in this heated argument and I’m pregnant and I just don’t want him to raise this one the way he is raising her. She had a phone by 7 years old and has been doing inappropriate stuff in the pass. I do not know if she is doing this in a way of acting out because her mom isn’t here (which is another story 🙄) or she just sees that he gives in and doesn’t care. Any advice?