Congrats to you!
I don't think I'd feel comfortable about my daughter getting married until she had several consecutive years of clean time, along with an ongoing recovery program.
She's codependent and dances around it all the time. Until she begins to truly address it, I figure she's a relapse waiting to happen. I also figure whoever she'd marry her at this point in time is probably codie as well, since we tend to gravitate to our own kind. That's another recipe for disaster.
Can you flip it around and look at this as a gift? He wants time to see where you're at and where you're going. How about doing the same with him?