My sister betrayed me?

[trinibaby]

n Christmas day I found out some things my sister had done. She made up lies about me and was telling these lies to her friends. Also things that I had confided in her, she was discussing with her friends on facebook. It was one of her friends who sent me screenshots of the messages she had been sending him for months. The things she said in these messages are hurting me so bad. I thought we were close, she was smiling to my face every day but slandering me to others. When I confronted her about it, she refused to address the lies she told and instead, she got mad at me for "ruining her christmas". Then she tried to blame the guy who told me, saying I should be mad at him for causing an argument between us. She never apologized. The day after, she sent me a message telling me "sh*t happens." I guess that was her apology. She then deleted me off facebook and blocked me like I was the one who did something wrong. I am hurting so much right now and I need some advice. Should I try to patch our relationship or just walk away? This is not the first time she has done this to me.