I think my boyfriend is doing drugs...?

dont be confrontational. wait until the atmosphere is relaxed and he is talkative. Start out by saying you have something you would like him to hear and you wan to say it because you love him. Then be direct, tell him the things you have listed. be very precise, he will deny it (if it is drugs) being specific makes it A LOT more difficult for him to deny. If your willing to seek help with him let him know, but also if its something serious you have to know what your limit is, and you have to be willing to stick to it, even if it means leaving him. You have to realize if it is a drug problem, you will not be able to "fix it" for him, and eventually you can find yourself in danger. Good luck, I dont envy you at all.