Hi ~ If you two are living together, it would be a good idea if one or the other moved out. This is a toxic relationship, and you don't need to live in the same apartment/house. It's not even a good friendship, from what I can tell.
You would do well with a psychologist/psychiatrist who specializes in co-dependency, plus meetings as well. But I do think therapy would be FIRST on my list. Therapy has always helped me immensely, and I've been in and out of it most of my adult life.
I wish you the very best. Please keep us posted on your progress, ok? God bless and please take care. Hugs, Lee