Hey, so sorry to hear you are going through this, you are not alone here tho. I am going through something similar but the relapse has actually turned into a much harder drug, the lies are constant and never stop, and the one thing I can advice is you can never fix it!
Through groups I have been reminded of the three C’s. You didn’t cause it, you can’t control it and you can’t cure it. It helps me a lot to be able to step back and just focus on me. I know that feeling of worrying that if you leave they will get worse and all I can say from my experience is, it really doesn’t matter what we do, they will use if they want and will not if they are ready to change. So sorry you are going through this, here if you want to talk x