Yeah actually despite the above post I think that, functionally speaking, incarceration makes it easier to leave, because he won't be able to follow you/etc. Being abused boils down to
allowing yourself to be abused, whichy boils down to a lack of self-esteem/self-love. You need to realize that an abuser does not love you in a true way, is not capable of truly loving someone. I was in an abusive relationship (emotionally abusive mostly, not physically, well not much, I'm a man and my ex-wife was a good bit smaller than me, although she did leave a bloody gash right next to my eye before and liked to full-arm slap me when she was mad, and once told me she was a breath away from stabbing me to death

). There were good aspects to the relationship as well, but ultimately that relationship was a horribly negative thing for me. It took me 12 years to finally leave, but I'm infinitely glad that I did. My life is so much better since then, and I finally stopped hating myself and feeling worthless. I have since found someone else and our relationship is so wonderful and fulfilling, she respects me and I respect her, it made me realize that what I had before wasn't really true love. It was a grotesque parody of love that brought me the most pain I have ever felt in my life.
You're worth more than that.

The only person who can get out of this is you. And all you have to do is say, fuck off, cut contact and move on.