It means that he will live long.
I had a dream lastnite that my ex boyfriend got shot and died, but he treats me sooo bad so I can't agree with the last answer. I do still have feelings for him but also know he isn't good for me.
You might have feelings for him still
Perhaps you are still sad that your broke up and would like to get back with him On the other hand it might mean that you are happy he is out of your life.
It could possibly mean that your dream is trying to show you, you something good in your life. Its showing you in your dream what it feels like to lose the person you love so treat him right before your dream comes true . . . .