Help?

Can somebody please help me with something? My boyfriend and I haven't been dating long & I already knew he parties a lot... but all he cares about is drugs. if he gets mad, he does drugs, if he gets upset, he does drugs... everytime he parties he does drugs. I've tried to ask him about it & talk to him about it, but he doesn't ever want to listen to me. he says he'll "think about" slowing down... and I'm not talking about marijuana, either. I'm talking about hard drugs & psychedelics. I don't know where else to turn to. he doesn't listen to me... I just figured I could post on here to get opinions & see if anybody else has been in my shoes. :/