What should I do ? I discover that my "friend" is a creep

Hey! I don’t use Reddit very often, but when I do, I usually get really great advice so I’m hoping you can help me again.

Today at school, my friend (let’s call him A) showed me photos he had taken of girls without their permission, girls of his vacation so its just random girls but you know, I mean for its the behavior of a creep. I’ve known him since last year, and he’s always had some red flags when it comes to relationships and friendships. But this feels different. This feels more serious.

I honestly don’t know what to do. Should I stay friends with him, or should I stop talking to him? What he did really scared me, and I can’t stop thinking about it.