The reality is that whether we're talking about real life or the characters in a book, television, or movie, you have to consider that circumstances impact how we grow. Who's in our lives? What do they need? What is the situation with our health? Finances? There are so many things that can change who you are, but it comes down to what matters to you and your overall morals.
In this book, we learn that Jorge Hernandez is the sole parent to his daughter, Maria. This appears to be a recent change that is already starting to shift his priorities. Add in a fast-moving romance with assassin Paige Noël, and suddenly the criminal playboy has a full-time family. Although somewhat sexist early on, Jorge is forced to view women differently as the story moves forward. Later in the series, he switches gears to talk about how powerful women are and how he admires their unique traits.
Another thing to keep in mind is that Jorge is a man who's all but escaped the cartel. He still has his connections but, for the most part, is more or less out. This is extremely rare. Most people involved in the cartel lifestyle either go to prison or end up dead. Having survived and come out on the other side, he begins to recognize that he has a chance to change his life. This is powerful.
Of course, like most of us, illness or recognizing the fragility of life tends to creep in with age. Jorge has had some health scares along the way that made him realize that it might not be a vengeful enemy that takes him out but his own body. This along with losing people close to him, causes Jorge to take a step back and reconsider how he wants to spend the second half of his life since the first half was full of brutality and danger.
Characters would be unrealistic if we didn't see them evolve through time because it's not natural. However, I will say I do appreciate the journey and, even more so, the surprises.