I have never been an addict but my brother has been a heroin addict for fifty years! My story is on here if you want to read it, and I know exactly what you are going through. You have done so well in your own recovery, please think about yourself and how strong you are to be rebuilding your life. Your boyfriend just isn’t ready to stop and there is nothing you can do about it, you have nothing to feel guilty for and it is awful watching someone you love slowly destroy themselves. Try and set boundaries with him so that you are not constantly worrying, easy to say, hard to do.
My brother has been as high as a kite and looked me in the eye and said he is clean, you know in your heart what he is doing, you don’t need drug tests to prove it.
I am not sure if this is a help, but just to show you that you are not alone, I am here.