“friend” shit talking me and saying im lying about SA

so for context 3 years ago when i was 16 i had a boyfriend who sexually abused me for the year we were together it was extremely traumatic but im in therapy working on healing. i didnt know what exactly was going on when it was happening because he told me it was normal so i believed him until we had broken up and i got with my now boyfriend who told me what happened was sexual assault. shortly after i had told my parents and siblings and 2 friends i felt safe with. about 6 months after that i told this girl who i thought was my friend and she was so supportive but flash forward to sunday and i got a call from another friend telling me that she was saying shit about me saying im lying about what happened for the attention so i can play the victim and made fun of something i told her in confidence about what happened that i rarely told anyone along with some other really hurtful shit and i didnt believe him i didnt think that she would ever say such a thing but he said he started recording because he wanted proof. i genuinely started sobbing on the floor of my brothers kitchen ive been friends with her since we were about 10.

i really dont want to confront her which is what my boyfriend is telling me to do. i dont know if i can without crying i could just block her on everything and never talk to her again but that would be hard considering we study the same thing in uni and are in a lot of classes together. i just dont know what to do i never thought i would be put in this situation with her.