My boyfriend doesn't want me to go out clubbing?

I have never cheated on my boyfriend, never been sneaky with him or anything. But every time I tell him that I'm going out he talks about how he doesn't want me to drink, be around guys (because they will hit on me). He gets stressed and all serious. I really don't understand it.. why? What can I do for him to be more confident with the though of me go out?
My boyfriend doesn't want me to go out clubbing?
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