Dreams about my dead dad being alive?

My dad died when I was 10. Im 15 now. Anyways I had a dream about my dad. I was at my grandmas house(my dads mom) and I heard a car door shut. I asked who it was and she just started smiling and said go see. I went outside and I saw my dad walking down the street to her house. All of a sudden I just started balling and ran up to him and gave him the biggest hug I've given anyone in my life. After that he said let's take a ride we need to talk. On the car ride he told me he was actually a secret agent and he had to fake his death so he wouldn't be killed. But he said those people were gone now n he could come back from hiding. We ended up at an airport and someone there recognized who he was.Then he pulled out a gun and shot the person and we had to run back to the car. On the ride home he said he had to go back into hiding and he was sorry and gave he a huge hug and said he loved me then he dropped me off at my grandmas and drove away. Wat does this dream mean?