Would you let your boyfriend go to a festival where his ex is gonna be?! I'm proper annoyed at him!

So this weekend in the UK it is V festival. I'm not going but my boyfriend is! I'm not happy at all. I don't trust his mates and his ex is going. His ex is psycho!!! I duno. I keep trying to agree with it but i can't i think about it and i flip on him! We're not on good terms at the moment. Would you be happy and let him go? 

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