I think he was buying in bulk and trying to pay for his own addiction by selling, unfortunately he never has enough to pay the dealers because he has used too much himself.
He does want to quit and he openly admits he is an addict, I actually thought he was doing OK again, he is still texting me and always tells me he loves me and that he’s OK and that he really is doing it this time but he needs to do it alone.. Ultimately I love him to pieces as we all do our children and I guess time will tell .