Idk what to do.

I live with my bf. I recently got a new job and they didn’t approve my Ultra Miami festival in March but I can go to EDC Las Vegas in May. I told my bf about it. We’ve been to ultra Miami last year but we haven’t been to EDC Vegas at all. This will be the first time. We were supposed to stay at Miami for a week in March but now I can’t go and I know this is selfish thinking but I don’t want him to go especially there’s two people in that group that I don’t trust and  don’t care for me at all or like me. I am never going to tell him to not go, but I also feel like it’s not right to leave your girlfriend for a whole week and go party and probably do drugs. I don’t know how I can talk to him or what I can do to convince him without telling him I would want him to stay . If it was the other way around, I wouldn’t go. I would stay here with my partner and wait until a few months to go to the next festival.  but I guess I just think different.