⚠MY BOYFRIEND IS DOING DRUGS PLEASE HELP

Okay so first off my boyfriend smokes weed, which I'm fine with, I smoke weed with him sometimes. A few months ago he asked me if I wad okay with him doing shrooms, I didn't really know what they were, so I said fine just for him to be careful. Well tonight she asked if he could do them again. And idk why but I'm more uneasy about it sense looking it up. Should I just tell him I'm okay with it? I think he would still do them tho, even if I said I wasn't okay with it.