what does my dream mean?

I had a dream that me and my mum were looking through some baby photos of me, then I came across some of me as a baby and another little baby who looked like the boy version of me so I asked my mum who he was and she told me that he was my twin brother (I'm unaware If I actually have any other siblings because I don't know my father) but I asked her where he was and she had told me that her ex boyfriend had killed him, I then remember breaking down and crying in my dream and I could actually feel the loss and pain when I awoke from this dream. Does this dream have a meaning behind it? I'm so confused as to why this boy showed up