The most frightening dream

I had a dream where I was coming home from the country on a large bus. After leaving a movie threater and wandering around in the snow for a bit, I finally found the bus stop just in time for he his to arrive. A thick forest lined the highway on either side and the snow fell heavily on the road. In front of the bus a car spun out of control when trying to change lanes and the bus ended up clipping the car and sending it in to the ditch. I got out of the bus and opened the passenger-side door. There was a man and woman inside the car, the man looked dead and the woman was screaming and crying. "It was supposed to be me!" She kept shouting. I tried to get her to calm down, but she kept flailing about, cutting the seatbelt strap deeper into her neck. She then reached to the side to unbuckled herself and in doing so ended up slitting her own throat. Blood gushed out on the wound and landed in my mouth, I started to vomit and the woman died, all the while shouting "you did this! You killed me!"