Dean was trying to protect you from the ghost that has latched on to you. But there's one problem - the ghost can't be banished because he's somehow attached to you and now it's up to you both to deal with not only him, but also your family's past.
Dean was trying to protect you from the ghost that has latched on to you. But there's one problem - the ghost can't be banished because he's somehow attached to you and now it's up to you both to deal with not only him, but also your family's past.