Hopeful - first of all, it's your choice whether or not you want to tell your boyfriend. If you don't, I don't think it would make you a bad person. Some people just aren't helpful about these sort of things. If you think he won't be, that's the last thing you need right now because it'll just make you want more drugs. Once you're ready and some time into recovery, try to tell him. If you're never ready, that's okay too. If you're ready and he turns his back on you, he's not a very amazing person after all.