Rebirth During the course of the story, an important event forces the main character to change their ways, often making them a better person.
He would like to embrace his children more fully, and maybe even start anew with a romantic interest. I think he feels like he's an unfit father because of what happened to Nina - afraid to really embrace them. Everyone he loves tends to get taken and/or murdered. So! Really developing a relationship and deepening the ones he has (friends, family, lovers) would be my jumping off point for him. He might even be up to running the school at some point.