boyfriend and drugs

hey girls! I need an honest and objective oppinion here.. so my boyfriend whom I've been with for two years takes mdma (extasy) and other party drugs now and then and i hate it. I'm all for trying new stuff and I would never forbid him from trying something if he's curious, but I don't like that it's becoming a usual thing he does when he goes partying. I don't want to tell him straight up that he has to stop because I'm affraid he'll just do behind my back (he now lives in a different country) and I also dont want to be annoying but I feel like he's different towards me since he took something last weekend and I don't like it. What should I do? How can I make him realise how dangerous it is to see hard drugs as "normal"? please help... 😔