Why is it so difficult to break up with a toxic person?

6 years relationship. He was toxic from day one but I was too young and in love to understand. He acted like he had 2 personalities. He was sweet then all of a sudden he was yelling at me for washing the dished but didn't sort them according to size and shape. All these years he went on and on about me being the worst person and no one else besides him will put up with me. All I did was trying to fix him. I destroyed myself in the process. I m still doing that because I didn't leave. I don't know how to leave this relationship. He doesn t respect me. I don't respect him either. It's chaos. He is very angry I changed. He is not on a pedestal anymore. I just stopped trying to make this relationship work. I stopped asking him to do couple activities. I was the only one insisting with that stuff anyway... please advice. This got to the point where my body is telling me to leave and I experience random physical pain.:(
Why is it so difficult to break up with a toxic person?
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