My brother invited me to a music festival a couple months away, and my GF told me today if I go and we camp there (instead of staying at a hotel) she is going to end the relationship. I've never been to a music festival of this size, and she has, saying it's far too crazy for someone in a relationship to go to one without their partner. She says she won't do that to herself and stay in the relationship, and she's baffled that I would even want to go without her.

Is camping at a music festivals that crazy? I'm not a big drinker or party-er, I just want to go for the experience. I told her giving me an ultimatum like this wasn't fair, and she's threatening the relationship if I don't agree to her terms. She has threatened the relationship in the past, but not quite to this level. I'm having trouble understanding who, if either of us, is being unreasonable in this situation.

My brother had just invited me to spend some quality time together, and not be a 3rd wheel to my GF and I. Her schedule wouldn't even allow her to go out when we go out, so she'd be flying in a day later and having to pay for all her own stuff (almost $1000, which she can't afford).