I NEED ADVICE. Please Read

I had a boyfriend & he broke up with me. He blocked me on social media and put another girl in bio on Facebook. I cried for days on my Bestfriend shoulder. Come to find out , she met up with him & ended up having sex with him in a parking lot. My Bestfriend sleeps around with plenty of guys &two; of them has girlfriends but I never thought she would do this to me. The boy almost took my virginity also & she knew that. When I confronted her she lied straight to my face and said it wasn't true and she said they kissed. I went on her Facebook account and found out they fucked. Also when I was venting to my other friend she told me what my Bestfriend did was wrong but she isn't gonna stop talking to her because my Bestfriend didn't do it to her and how my other friends needs to mind their business and be their own person because my other friends stop talking to her because they feel like my Bestfriend gonna fuck their man too . Even after I found out my Bestfriend did that I cut her off but she still in contact with the boy and talking freaky which shows she doesn't even care about me. I'm so hurt by this😞