You aren't weak. But I wonder what you would think of writing down, possibly here, why you might want to stay (and pros and cons), as well as why you might want to leave (and pros and cons).

I think it might also be good to consider how likely each option is to work out the way that you want it to. Will this rageful person actually be willing to go therapy and to stick with it--for however long it takes (like, as is quite likely, years)? How can you tell, and why hasn't that happened before now? How will he treat you in the meantime?

Do you go to therapy now?

Do you have a safety plan in place in case you need to leave at once?