I think that if you stay with him after he hit you, then you are teaching him that hitting you is OK. You would be allowing him to get away with mistreating you without consequence, therefore he will not hesitate to do it again.

I know that you said you have nowhere to go, but have you explored all of your options? There are very often many resources in the community that exist to help people in your very situation. There are also religious organizations who can help. The Legal Aid society should be able to direct you to these resources if you are in the US.