I had a nightmare about my boyfriend dying?

I'm completely distraught over this nightmare. I woke up nearly in tears. I don't completely remember the entire thing (Because you usually forget all the details when you wake up), but it was completely traumatizing.

It started with my boyfriend posting to some unknown social media on the lines of "I don't feel like myself today, I just need some medication and rest". After a period of time, my friend busted through the door saying that they found his body, mangled and bloody... I was so helpless in the dream.

What could this mean? This dream really upset me. : (
I had a nightmare about my boyfriend dying?
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