Felix acted like an idiot because he doesn't want anyone to see another side of him, he wants everyone to see him as tough, especially you, he wants you to hate him, because if you didn't hate him, it would be hard for him to hate you. he always has headaches and feels low, but he hides it, he doesn't want anyone to feel sorry for him, much less you, but yes, he have feelings, dark ones, he feels so sad