Pock89, I am so sorry!
The good news is that you have grown so much - you are making good choices for you, and you have the tools to continue to do so. It's natural for you to be heartbroken, but keep your wits about you.
Perhaps this "slip" was just the "slip that prevents a fall" and your boyfriend will decide he doesn't want to go back to that life...and embrace true recovery. Or perhaps he still needs to go back out and do more field work. Only time will tell - but only you know how long you are willing to put your life on hold to see what the next act brings.
Take care of yourself.