I waited till my daughter left for college, and I shortly moved out to a ratty furnished trailer thereafter. By then, I had my own job and means of support. Money was a big issue as well as custody of our one daughter, being threatened with taking her from me and putting me "out in the street" if I tried to leave. I was never physically abused, however, so I stayed till custody was not an issue, as well as having a good job as a teacher. If you are physically abused, or even mentally, I say go to a shelter, as others here have suggested.
Patty