I have a question... need serious answer please...?

OK, my boyfriend is going to a cabin to go hunting with his guy family members and his cuzin,,,, oh geez, his cuzin wants him to get drunk with him.. and he talked to me about it saying why can i go drink and party but he can't and here's the thing I HAVE NEVER DRANK BEFORE!! or yet partied, in my life!!! and last year he drank with his friends (AT AGE 14), and the next day at school his best friend told me about it, while my boyfriend was laughing i confronted him about it, he thought i was over reacting. but i stayed with ham, and now he wants to do it again... after saying that him and his cuzin were going to live life like they were dying UNTIL HE MET ME!! so, tell me what i should do or if i over reacted?? thanks..