Do I have the right to give my boyfriend an ultimatum between our relationship & a rave?

My boyfriend is a wonderful guy and you do trust him but he told me he is making plans to go to tomorrowland (the worlds biggest rave, literally across the world) with his two single friends, it's not that I don't trust him but I don't trust all the half naked girls all f***ed up on drugs and people do things they wouldn't normally do in a rave setting when they are all on ecstasy (I know he will do it) I told him this and he is still making plans to go even though he knows how uncomfortable it makes me, I ended up saying that I don't feel comfortable and that I don't believe a rave is a setting for someone in a serious relationship to be in, especially not the world biggest rave across the world and then continued to say that if he chooses to go that I will not stay with him? Is this selfish or am I being overly jealous or is this reasonable? I really need others opinions on this please.
Do I have the right to give my boyfriend an ultimatum between our relationship & a rave?
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