Raining Glass Dream

Long story short, I (M23) was in a situationship with a woman (F23) that lasted for a few months. Before our situationship began, she admitted to being obsessed with me, and it rubbed me the wrong way to the point where I would always get a bad feeling whenever she was near me. However, I decided to start a situationship because she was the only girl that expressed interest in me. My friend warned me to not sleep with her a few hours before she stayed over at my apartment for the first time, and I had a dream that pieces of glass came down from the sky and pierced my skin when she stayed over for the first time. What does this dream mean?