How to leave a friendship?

Last year around this time I became friends with an upperclassman and I thought she was so cool, she was in my hobby which is theatre, in theatre we are required to interact with everybody.(please remember this)! Well the point is- she gave really good advice.. or so I thought she did and so I trusted her with everything. With my whole heart and I regret that so much, during the summer of this year a whole lot of drama happened and I realize that she isn’t the best person. She was saying bad stuff about the religion she KNOWS im in right in front of my face. She used that she was there for me when my ex best friend had stabbed me in the back and she used that against me. I don’t want to be around her anymore, i can't. It hurts me to be around someone that disrespects me so bad and talks bad about everyone in the school even when I state I don’t like that. im in theatre and competitive acting and she is too. I already have a big dap of distance from her but I feel like I need more because it still hurts me💔 I’ve tried everything in my heart to forgive her when she hasn’t even apologized (INFACT she made me apologize) and it hurts that I cannot..
How to leave a friendship?
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