The way I think about it your natures are different. You can be hot and cold sometimes, as in go from affectionate to overreacting. And as she said, she is a slower steadier person. If she decides to try again with you, it might not improve her feelings quickly. You both may need to work on rebuilding trust and nurturing a more positive relationship. It would mean living with feelings of insecurity and learning to not overreact to them.