<human>: Reddit, I really don't know what to do.

Everything went to hell lately and I have no idea how to deal with. 

Long story short to leave out any more identifying details than have already been included, my girlfriends father became furious with me about something I and everyone around me (I have only spoken to people I know who are also parents about it) views as not serious enough to constitute him acting how he is. He seen a single hickey on her neck after us having spent a couple years together. I understand him being angry, but I've given him no reason to dislike me before this in any way. We are both in high school, so that also poses a problem.

Because of how he became furious with me, he sent an extremely angry text to me of which he called me any number of names (basically saying I'm scum and can't see his daughter anymore) and also threatened me. I am not stupid in the slightest. I have not done anything to disrespect my girlfriend in any way nor have I had any intentions of hurting her. I don't deserve to be spoken to like that.

I told my girlfriend about the text and how it was extremely condescending and contained a threat. Since then, she's been upset I view him in that way and is angry with me... totally ignoring the fact that he berated me as well as THREATENED ME. She also said "You need to change how you think" which really upset me too. I shouldn't have to change for anyone.

I don't know what to do. I care about her a lot and we've been dating for over two years making it my first real relationship. We've never really argued like this before.

I'm a mess and I really need a view from on outside party. What should I do?

Provide a brief overview of the text.
<bot>: Girlfriends dad is mad at me, has threatened me, and she is taking his side in all of it?