I have learned to trust my instincts, I wouldn't postphone anything.
A week in rehab and a week in recovery is but a drop in the bucket. If he gets it all together and remains in recovery for at least a year you can always rekindle your romance, and, that does mean you need to marry. Relapse is very common and there is so much to be lost when you are married to an alcoholic and or addict. A married person can be ruined financially, and in some cases never recover from the experience.
I would trust my gut!