Am I bad for cutting my friend off without explanation?

Anonymous

I cut my friend off recently and blocked her on everything. Because she was sneaky, was jealous throughout the friendship and backstabbed me in the worst ways possible. She tried to sabotage my other relationships and cause trouble etc. She also slept with my boyfriend a year ago. It was bad. She knows what she did to me.

I feel bad because I didn't talk to her before "ending" the friendship, but I felt that she would twist my words around to others and manipulate me if I did talk to her about ending it. Is this a bad thing I did? I blocked her and her boyfriend randomly without warning. Have I been an asshole by doing this?

Am I bad for cutting my friend off without explanation?
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