I’ve been where you are, confronted dealers, chased him down to drug dens, almost lost my mind. You can’t stop yourself anymore than he can stop using. You take it personally and anger becomes your best friend as you feel like you are losing your mind. Nothing will stop you on your own journey as you go through all this until you find your own way to break free. Unless and until he hits rock bottom and decides to get help (which may never happen) you HAVE to get away from him. You can’t help him, change him, save him or make him stop. How many times do you want to run into the burning building to drag him out, only for him to run back inside? Get rid of one dealer and there’s another there in a second to replace him.
Step away, however long it takes. However many times it takes you, step away. Because each time you do, you will get stronger. Step back and put up your boundaries. Because unless you do, all this will do is destroy you, mentally and physically. You will become ill. And suffer depression, anxiety and Illnesses.
Start reclaiming your peace of mind and stop giving him head space. It’s difficult to accept but you can’t help him, only HE can help himself. Until he does that, you have to step away.