Drug scares

I'll make this as short as possible but recently my boyfriend has been showing a lot of interest in drugs and 'tripping', I've never been into this myself because it scares me because the trips are unpredictable. At the moment he takes LSD, which is a hallucinogenic drug with unpredictable trips. He doesn't do it a ridiculous amount but he does it when he wants to, he also has this one friend called Hughie who is really involved with drugs etc, he also sleeps with a lot of girls and I feel like this is a bad influence? I don't want to be controlling but it scares the life out of me and I hate the thought of it, even when he asks if I'm okay with it I say no and he belittles me by telling me I don't have any points to support what I'm saying.

What do you guys think?