You mentioned twice about your boyfriend selling drugs. If it were true that he was "only" selling drugs, not using them, would you be okay with that? Is that the kind of life partner you desire and can trust? One that helps other individuals ruin their lives? Drugs that are abused as the drugs we are all talking about here on this site are straight from the depths of hell. They not only ruin lives, they kill.
You can't make your boyfriend see the truth. He has to see it for himself. We who love the addicts in our lives far too often make it easy for them to avoid the truth by covering up for them and giving them a soft place to fall.
I'm glad you have decided to get your own apartment. Smart move.