Was my best friend being a bad friend?

Two years ago, I was in an abusive relationship with a guy who told me upfront he had a depression. I soon realized he must be straight out lying and must have had some other much more serious disorder, because his meds didn't add up and he had erratic behaviour, violent tendencies and acted bizzarely socially (ie interpreting social queus badly, trouble looking you in the eye...) . I assumed schizopherenia, but never had the courage to asked him.

This guy was very abusive to me, bullying me into dating him, resorting to really bad name calling, fat shaming me almost into anorexia, threatening to leave me, and even threatened me with physical violence on occasion. I was young, confused, emotionally drained and didn't even try to leave. He was the one who left me, after barely a month, deeply affecting my mental health.

A year later, he came running back, and because he was my first boyfriend I naively took him back. In the space of that year, I'd lost about 30 pounds, so I know weighed 106 and had developed anemia, and he still called me fat. The abuse continued and I kept on coming back.

One day, I had enough, and gave him a piece of my mind. I told him he was the worst thing that had ever happened to me, that my life was so much worse becuase of him, and about how he made hate myself and my body, as well as how I barely ate anymore (and other personal things).

The realtionship, again was short; he left me about a week later, but at that point I'd had enough too. This second time around was only a month as well.

But when I told my best friend, about how telling him how I felt was like a weight of my chest, and really helped my mental health, all she did was berate me, and tell me that I shouldn't have done it, because of his "situation" (probable schizofrenia), and that my actions had consequences. She didn't seem to care at a lot that it really helped my sanity, but made me feel guilty for standing up for myself in a tough situation. She hadn't even met him once, so they weren't even friends for her to stick up for him like that.

She was aware of the full situation, both times, and of course never approved, but always seemed to stick up for him. She vocally told me to leave, but thought that I was being despicable by telling him my emotions.My question is, was she being a bad friend for not being there for me?