I agree with Vicomom...I have been on both sides too...TOUGH call....
Really, I think you should decide AFTER he completes treatment. See how you both feel. See how he's doing in his recovery.....you wouldn't want to jeopardize his or your recovery....if he's not doing well it could be a disaster for both of you. In rehab they tell a person to change his playmates and playgrounds and not to have a relationship for a year. I'd say to just wait and see what he learns in rehab, how he works through everything, how he works his program AND watch out for your own clean time. There's really no rush to make a decision right now. He will actually (I hope) see that when he's in rehab.
Peace.....
And I meant "your beliefs" as a general thing... Not as YOUR beliefs, like you personally...
Sorry.
I have been both an addict and in your position (though I was there for years).
Part of me wants to say, "Stick by his side..."
And this other part of me wants to scream and shake you and say, "RUN! One week does not mean you are bound to him and must go through all of this... This disease (according to your beliefs) ***** the life out of not only the user but those around them..."
Do you love him? Are you prepared to possibly be let down?
There's a chance he might walk out of treatment and be a fine, upstanding, productive man... And there's a chance his low might be lower than you or he ever dreamed...
It's a tough call.
Follow your gut because sometimes your heart lies.
And also, I'm sorry if I have given terrible advice... I have a kind of biased opinion on this and not one even I am clear on.