Let Go or Fix

Hello, earlier this year, I found out that someone who I thought was a very close friend was talking badly behind my back. I was going through a lot last year and this year only to be judged, criticized, and talked negatively by someone who I considered a best friend. I never told her who told me, but when I did confront her, they denied everything and put the blame on someone else differently because they thought a specific person told me when in reality, it was someone else. This told me she talks about me with more people, and I can't trust her. After the talk, I gave her another chance, and things seemed to go well until it was time for a huge event I said I could attend. There were two events that day, but due to a heavy workload, I could only participate in one of the two events from that day. I arrived at the second event, and when I got there, it was awkward; I was not greeted, and I kept trying to have a conversation with her and others, but I was being ignored, and sarcastic tones were thrown at me, and due to this, I left early. Fast forward to this month, I had invited her to a huge celebration months in advance for this month, and she confirmed a while back she could attend. But the week of she said she can't because she is going to other events. I felt something was off and the day of the events I found out she lied AGAIN, she never went to those places. I don't know what to do anymore when she keeps lying and she is not honest about how she feels. Should I just end this friendship or I don't know.

Side note, not even the other people I'm friends with talk to me so I'm worried she might have spoken badly about me with a lie.