If a relationship is that dysfunctional and abusive and there are no children involved, I would end it and move on. If there were children, I would have my partner move out (if he lived with me to avoid violence in front of the kids) and try to work it out through counseling. The biggest need here is the need for a relationship with the Lord and His power, mercy, love, and hope. My opinion!
I think it would entirely depend upon the commitment of the other person. If I saw him making an effort, I would too. Relationships cannot last if it is one sided.
If I really cared for my S/O I would try to work it out. AS it is , right now, I have a Lady friend whom I really care for. I will do everthing in my power to keep and stay with. I know that she fells the same way.
If people really love each other, they won't do anything to intentionally hurt each other. That doesn't mean they might not do something which ends up hurting their partner. If and when that happens, they should apologize immediately & sincerely, and work things out.