In Blue Lock, the players deal with betrayals and alliances by strategizing and adapting to the changing dynamics of the competition. Betrayals are often met with a mix of shock, anger, and determination to overcome the obstacle. Players may choose to confront the betrayer directly or work on strengthening their own skills to prove their worth. Alliances are formed based on mutual goals and trust, with players supporting each other to achieve success in the intense training program of Blue Lock. Ultimately, the players navigate through the challenges of betrayals and alliances by staying focused on their individual growth and the overall goal of becoming the ultimate striker.