Talk to someone who understands drug addiction.
Learn the facts about Meth addiction.
Develop an attitude to match the facts.
Take care of your needs and let the addict take care of their needs.
Maintain a healthy and consistent atmosphere in your home, as much as possible.
Preach and lecture to the addict.
Make excuses for the addict.
Believe that you are the cause of the other person's drug addiction.
Protect the addict from drug situations whether using or in a recovery program.
Rescue... Let the addict clear up their own mistakes and assume the responsibility for the consequences of their using behavior.