My gf is crying over my drug problem again. how do i stop this habit!?

Treatment programs: Most people with long-standing drug problems (depends somewhat on the drug, which you don't list) cannot handle it all by themselves. There are many chemical dependency programs - you can google that name and your location and can find programs near you. Medical detoxification, psychiatric evaluation, medication for underlying problems, counseling, all may help you get back to a normal life.