My best friend choose my abuser over me.

Long story short my best friend of 15 years chose my abuser over me. Her boyfriend is currently friends with my abuser instead of her just being cordial when he comes around (which is all I asked) she now goes to dinners with him, hikes, the mall. After confronting her and telling it hurts my feelings that she is hanging out with the person who put bruises on me!!! Which she saw! She told me she just wants to stay neutral. I ended our friendship because I couldn’t deal with the toxicity. It took me a long time to not only get away from my abuser but to get over the pain he has caused. Am I wrong for feeling upset? Is she a bad friend? Am I doing the wrong thing?