Awful Dream Experience, need hlp interpreting it.?

OK so basically, my girlfriend and I were walking around this second story at these apartments, we were just walking and talking for a really long time. Out of the blue she simply hopped over the gate, and dived into the concrete head first, and the horrible thing is i witnessed it, like i saw her head hit, and i went running down the stairs and in the end i just had her in my arms and i was screaming and crying, and i woke up suddenly and began to cry and checked on her immediately, she was fine, another strange thing, when i awoke, I just felt like there was an evil presence in our house.It just gave me that feeling. What does it mean.