Hi Nash
Since you're new to addictive behavior let me share a few things with you that I've learned (being the parent of an addict).
1. Addicts are MASTERS at manipulation. And I mean masters! You have to be on your toes 24/7 and have a deep resolve not to fall for it.
2. Addicts are MASTERS at the blame game. It is always someone elses fault. Never their own. NEVER
3. Addicts LOVE having an "secret ally". It gives them more power and more freedom to use without consequences. Don't fall for it.
4. Addicts ALWAYS have a reason for why they are using and why they are keeping secrets. They can justify anything.
5. Addicts are sullen, full of self-pity, always feel they are the victim of persecution, and sneaky.
I can say these things because I have lived these things and I love my daughter.
But she didn't start to get well until I stopped falling for all her crap.
Your boyfriend has relapsed. Maybe not on heroin but he's relapsed all the same and he is using you to keep the habit going. Tell his family. Tell them now!