Think of the last time something good happened to a friend. You probably said, "I'm so happy for you!" Were you, really? If so, great! If not, why?
Jealousy is really common. We all have insecurities and some level of competitiveness. Remember CBT in Mission 1, and the idea that the only person you can control is yourself? How will you manage yourself to be the best you can be? Does supporting others actually help you toward your own goals?