Been a drinker, a junkie and got an addict partner who I've been on and off and up and down with for seven years now. Agree with the guys above me...get out. Don't nag. Don't give ultimatums. Just end it. Even if that breaks your heart, the pieces will be easier to collect than after a few years of having it shattered and re-shattered by an addict.
If you can't make him 'see the light' by leaving permanently there is nothing you could have done by staying with him to help him or yourself. And if, against all odds, your leaving makes him admit to having a problem and seek help then maybe (way) down the line the two of you can talk.
Either way, everyday you stay in this situation is another day of your life you've invested into a sinking ship, another day you'll never get back, another day, another day until you're stuck too...co-depending on an addict.
You both deserve more than that, but right now you're the only one able to provide that for yourself, and in turn, (it is improbable, but not impossible) for him.
Do both of you a favour...don't put up with this or being treat like this. It is not ok and you do not deserve it.