Do I have to talk to my toxic "bestfriend" before cutting her off?

Anonymous
So this "BFF" of mine slept with my ex a year ago behind my back, while pretending to be rooting for us to get back together. She rubbed it in my face and deliberately tried to humiliate me in front of him and then started dating him. She then tried to steal my new man and cheat on my ex with my boyfriend. This year, she spread a rumour about me to other people that wasn't true. In short, she's been a disgusting friend.

I've decided to cut off this girl and block her. Do you think it's wise to tell her I want to end the friendship? We've been "friends" for 3 years.

I feel she doesn't even deserve for me to explain it to her, but she is under the impression that we are still friends and sometimes reaches out to me. So it may come as a shock to just cut her off.

Can I just block her on all social media out of the blue without saying anything, or would that be unwise?
Do I have to talk to my toxic "bestfriend" before cutting her off?
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