Just need some advice please

Kinda having mixed feeling and know know if being upset or angry is worth it. So my best friend still keeps in contact with my rapist (texts, snap streak, hang out all that) even after i told her what he had done to me and her knowing how hard it’s been for me. We are all in the same friend group so I still see him at times but avoid contact at all costs. They were friends before i was close with my best friend so I feel like it’s a lot to ask her to cut contact with him but it bothers me that she doesn’t see it as a problem. I just don’t know what to think sorry if this doesn’t make sense tried to make a long story short. :(