Freaky dream. What's it mean?

i was in my school, and my boyfriend came in my class that i was in, I was so happy i jumped up and gave him a hug and said 'i've missed you! i love you!'
Then we heard a gunshot, and everyone in my class hid in the corner of the classroom we were in. my bf was standing in front of me, like he was shielding me, and he was holding my hand. then someone with a gun came into the classroom and started shooting all of my friends. once they all got shot, the person with the gun grabbed my bf's arm and for some reason i couldn't move, i dont know why tho, but the guy with the gun shot my bf 3 times, and he wasnt dead, but he was in a lot of pain. and for some reason, i could feel pain on me where he had got shot, even though i wasnt hurt. but then the guy with the gun shot and killed my bf. i started crying and the guy with the gun just laughed.
i woke up and i was crying.

the only reason i can think of why in the dream, when i said that i missed him is b/c him and i just recently talked about him going in the marines and we were talking about him being on leave.
any ideas of why i had the dream?
 
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