What's wrong with Edward

Edward and Bella have been 'going steady" for this past school year, but, Something is not right with Edward. He's gotten really mean and angry, all the time now. What is going on with him? His best friend, Jasper, has almost given up on Edward. Bella is heartbroken. He ignores her, yells at her when he talks to her . No one knows what is wrong. Carlisle and Esme, his parents