Think long and hard about whether or not you can go the distance with an addict trying to recover. The top priority for the rest of his life is going to have to be recovery in order to stay clean. That means before anyone or anything else. Including marriage, family, career, etc. Can you deal with that? And what if he slips again? Can you watch him try to recover again? I'm not saying any of this to scare you. But to make you aware of what you very well may be facing going forward in your life with this person. Read around in the friends and family sections. You'll get an idea of what it can be like real quick.
Hugs to you.