Drugs are number one to him, if you try to come between him and the drug you become the enemy.
You know, if you intend to be in a relationship, you really need to accept the person just the way they are. If that includes active addiction to meth and sex, then it does.
I mean little things can be changed, maybe they can be convinced to drink almond milk instead of regular or asked to remember to leave the toilet seat down.
You can't change someone (and really, why would you want to?) you can't control them, or the addiction.
You might find these articles helpful: Addiction, Lies and Relationships
http://www.bma-wellness.com/papers/A..._Lies_Rel.html