Someone like JJK immediately gets angry when things don't go his way. This time he's terrified he won't see Dan again, but he knows he can only blame himself so there's no point in getting mad. He also didn't magically turn to someone who can be honest about his feeling, apologize and beg for forgiveness, he makes some progress in his head at first. That's good, the character development is character developing
Someone like JJK immediately gets angry when things don't go his way. This time he's terrified he won't see Dan again, but he knows he can only blame himself so there's no point in getting mad. He also didn't magically turn to someone who can be honest about his feeling, apologize and beg for forgiveness, he makes some progress in his head at first. That's good, the character development is character developing