From Jason's Bio
In August, Jason and Elizabeth Webber became friends after he rescued her when she was harassed by a man at Jake's bar. At the time she was mourning the loss of Lucky Spencer, her fiancé, who was presumed dead. Jason and Carly teamed up and learned in October that Sonnys new love Hannah Scott was an FBI agent who wanted to bust Sonny. Jason told Sonny the truth and then helped Sonny recover from his mental breakdown in November. Over the course of time, Jason fell in love with Carly and although he told Sonny, he hadn't yet told Carly. In December Carly saw Jason and Elizabeth dancing together at Kellys and became jealous. She went to see Sonny to ask him what was going on. Rather than telling Carly that he knew Jason was in love with her, Sonny led Carly to believe that Jason was instead involved with Elizabeth. Carly believed Sonny. She then slept with him. Jason was shot and found out that Carly had slept with Sonny when he arrived, wounded, at Sonny's penthouse. Devastated by their apparent betrayal, Jason left and wandered around until he collapsed near his old abandoned boxcar. Elizabeth found him unconscious, frozen, and bleeding to death in the snow and dragged him into the boxcar. Elizabeth went to Sonny and Bobbie Spencer to tell them what happened and they came to help Jason, but Jason refused to speak to Sonny or go to the hospital. Elizabeth took Jason to her art studio where she had Bobbie remove the bullet and close Jason's wound. She nursed him back to health. Carly hated Elizabeth what she saw as Elizabeth's manipulative behavior with Jason and for being the impetus for her one-night stand with Sonny. Jason saved Elizabeths life after a bomb was placed in her art studio. He tried to end their friendship after Sorel started to threaten her.
Jason was unable to deal with Sonny and Carlys betrayal and felt the people he cared about would be safer if he was not around. He also could not stand Carlys crazy attempts to get back into his affections. He gave Sonny power of attorney over all his accounts and control over his assets which had been put in a trust fund for Michael. He left town on January 17, 2000.