<human>: Basically for this years prom (my junior year of high school), my two best friends(Kevin and Jake) and I decided we would decide on our prom date by drawing from a hat full of names. Clearly and ingenious system. Anyway on of those two friends friends(jake), My date, and I were all hanging out at my house. And as teenagers do we started flirting and being hormonal sex machines. I should also mention that this girl is a bit of a hoe, but shes still a good friend. Anyway she was flirting with both of us and we both went along with it. A little free boob action and fooling around was all in good fun. However as the evening moved on I stopped flirting because I didn't want to get involved with anything at the moment, and I had prom as an option to hook up with her. However my best friend continued to push on with the flirting, and she happily obliged. So eventually I pulled him aside and told him he had taken it a little over the edge and asked him to back off. He apologized and told me he didn't notice and he was just a little too horny. He drove her home ten minutes later. About half an hour later my other friend, Kevin, calls me and says that Jake just told him some "Fucked up shit man". So I called Jake and he explained to me that they made out in his car and she gave him a handjob. I had never felt so betrayed in my life so I told him we were no longer friends and I didn't want to talk to him until I was ready. So my question is, where do I go from here? Do I dump my date? Or just expect this as part of her nature? Iv'e just never been so confused,and I know there are some Redditors who can give some insight. Thank you.

Could you distill the essence of the text into 1-3 sentences?
<bot>: ? : my best friend hooked up with my prom date minutes after I asked him to back off and now I don't know what to do. Both in regards to prom and our friendship.