dream (yume)

1 had an reoccurring dream about my boyfriend being killed in the army in front of me by his Sergeant..What i remember was, we were making love, loving each other so deeply..and then that Sergeant came, bringing a big gun, telling us, no love allowed, something like that..I shield him and begged not to kill him but he did..he shot him...I remembered crying in my sleep so badly..I open my eyes and feel so depressed cause..I don't have a boyfriend! then I fall asleep again...but the dream came back...I woke up 4 times, stopping the dream, but it appeared again...as it...it from the past? or the future?
it not nice....i mean...why must you killed him just because he fall in love? he didn't do anything...I hate that dream....and if it my past..I hate the person who killed him...