You gotten so much wonderful advice, but it's up to you to act on it. I've been the addict/alcoholic in my relationships. I thought I would add my perspective.
Originally Posted by
mareahh 
I have the mindset that if he uses again. I'm gone.
- Your boyfriend told you, at the outset, that he was an addict (though in recovery). You didn't leave.
- He relapsed. You didn't leave.
- He went to jail for drug related offenses. You didn't leave.
Say he comes out, and uses again. Maybe he tells you, maybe he doesn't. Maybe you figure it out on your own. Is he worried you'll leave? Prior experience says no. If you stayed before, you'll stay now. That's what I'd be thinking.
Maybe leaving him to his recovery is the best thing you can do for him. Give him time; give him space. I hope for his sake he can stay clean. If he does, then perhaps you have a chance...down the road.
Good luck.