What Can This Dream Mean?

I been having this dream for three nights straight. Ok its halloween and im dressed up in a Jason costume with a chain saw. I go up to an ex girlfriends house and shes outside with her friends passing out candy. I walk up to her (she doesnt know its me) and her and her friends start laughing and ask “arent you a little too old for halloween?” im silent. They start poking me and laughing and i start revving the chain saw to scare them. They think its fake and start joking around. I walk away and wait a couple hours till her friends leave. I follow her as shes going back into her house and i shove the chain saw in her door before she can close it. Shes startled, but she turns around and starts laughing and says, “ oh you again, we dont have anymore candy.” i close the door and start up the chain saw as she sees its not a joke anymore. She starts screaming calling for her parents but finds them dead already. She trips and i start cutting her up with the chain saw till she dies. Through out this dream i am calm and silent. What can this mean? We’ve been broken up for a year already.