Should we still be friends after what she did to me?

So I was dating this guy , and I got in trouble with the cops , so I wasnt home for a month …when I got out , I heard my “best friend” had sex with my boyfriend , and he messaged me on a social site , saying he really had to talk to me , I said no fuck that , because I had a feeling I knew what it was . So then I confronted my best friend on a social site since I hadnt seen her for a while after we got in trouble with the cops . (nothing bad I got caught drivin with no licence) so she didnt reply, only read it . Then I asked her again and she swore to god nothing had happened and on our friendship which I believed her until I asked her other best friend the other day and she said that she did have sex with him because she told her when it happened . I should of known since she sleeps with every guy she can . And she lied to my boyfriend now ex about me so he would hate me , so now I know they for sure did, I want to confront her again , although im sure she will only lie . But we have been best friends , for years and years since 4th grade and we are now a sophmore . Should we still be friends ? Or do I deserve better ?? Help please !