Feel like my friends betrayed me

This may be kind of stupid, but I recently noticed that a few of my “close” friends are following/being followed on social media by some people who I’ve had serious problems with. One of which is the girl who left me alone in a basement, drunk, high, and disoriented to be raped by a boy who was cheating with her. Afterwards she harassed me on and off for several months at school and on social media, calling me a slut and urging others to block me out. I realize that the following has little significance, but it still hurt to see that even after this experience, which was and is incredibly painful for me, the people that I’ve known since I was a child are still supporting her in that small way. I don’t want to bring it up because it’s crazy that I even checked. What should I do?