Deadline part two

I didn't really get why Dallas got so mad at Ben when he told her about his illness. I understand that she would be upset that he is going to die and leave her but I don't think she should have gotten mad. If I were her I would have been glad he told me so I wouldn't be so shocked and hurt when it happened. I really hope they explain who Hey-soos is because he knows everything that's going to happen but wont't tell Ben. Ben thinks that Hey-soos could possibly been himself but if it were like a spirit version of himself wouldn't he tell him? Thats how confused I am with this spirit guy right now! But I also think it could be like God or something.