Boyfriend jerking off to people he knows

Is it weird that my boyfriend jerks off not only to porn, but to pictures of girls he knows in real life? I was really hurt when I found out about this but he said I was being controlling and that every guy does it. I said he can do it to porn and to pictures of me, but I just don’t like the thought of him doing it to other girls he personally knows. What are your thoughts? Am I being controlling?