Jessica
What I want to say to you Is Run. Run like hell and don't look back. Don't marry this guy.
Since I don't think you will do that, may I shed a little light on this fight?
He screamed at you and ran out because he is an addict. He made up that sorry a$$ story about drug dealers getting him hooked on heroin because he is an addict. He went over to his friends and made sure your friend saw tears because he is an addict.
Addicts care about one thing and one thing only and that is where they will get their next fix. Addicts lie, manipulate, scream, run away, cry, or whatever they need to to get their next fix.
More than likely he is smoking H because its cheaper than Oxy. And if he moved from Oxy to H, it means he running out of money. I'd be keeping a an eye on the finances. He ran because he needs time to think up a story. He ran so you get scared and welcome him home with open arms. My guess....you'll have a rerun of this fight a couple hundred times in the near future if you stay.
RUN.