Does she want to fuck some other guy?

OK so I've been seeing this girls for over a week, and things have been moving way faster then I've wanted to. we are both in our early 20's. she has introduced me to her parents and I have introduced her to mine. we see each other almost everyday and talk on the phone every day we don't. she tells me about how she's been talking about me with her family and friends, and enjoys talking and being around me. she's very sexual more so then anyone I've ever been with and way more then I am. I'm looking to get to know someone, and I've told her this multiple times before having sex. I asked her what she thinks about us and what she thinks about me; she had no answer to either. I told her that that's fine with me, after all were just starting to get to know each other. however she often say's that its ok if I was to fuck some other girl (this is my problem and it definitely does NOT stem from a low self of steam). an example of this is me-" yeah me and my friends have rented a cabin in Montana for new years. there's 15 of us but my buddies sister is bringing a bounce of her friends so" (interrupts) " oh good maybe you can get your dick wet". saying that suggests to me that she thinks it would be ok to fuck some other guy! she has asked me about a threesome already which I said I would never do ( two guys ). today is her birthday and she's going to the bar in some sluty outfit and getting shit faced with her friends. I was so mad about this whole conversation that I canceled on seeing her today via text- "Im bailing on tomorrow" "ok.why?" "im busy now somethings come up" "alright :(" "yep sorry" "good night mark" "night" "you alright?" "yeah im fine" "ok". anyways now im just sitting her at home losing my mind. I dont think its fine to be sleeping with other people if your already sleeping with someone else, if so you should clearly say it and break up. I've been very calm and patient with her but this is too much for me. what should I do? bring this up in a text or phone call? wait till tomorrow to do anything because today is her b-day? idk

you cannot be okay with things that u are clearly not comfortable with,maybe a little talk with your gf might help her see how u feel otherwise there is always a breakup