This is truth but the man you love when he is using is not the man you fell in love with… It’s a bit harsh I suggest you try and get some help there is a charity that posts on here who give some great advice.
I can help you best I can with advice but the fact is unt he is willing to go through hell and bring himself off it when he’s ready this will continue. The behaviour won’t stop.
He has to be ready and want to do it. Nothing you say or empty threats will make him stop. If you say you are gon a leave you have to do it and make him prove he is clean.
My wife left me numerous times but I always knew she’d come back… The last time 9 months ago I knew she was serious and she hasn’t come back.
I’ve not done it for her this time though I did it for me which is a major factor and my children