Carly and Jason originally met in a bar and after several encounters began having nameless (HOT!) sex. They agreed to see each other only for sex, but that agreement didn't work out, they began fighting. They stopped the arangement once Jason decided he didn't want to cheat on his girlfriend Robin anymore. Jason and Carly managed to retain a friendship, though.
Then, months later, a pregnant Carly came to Jason needing help. The father of her baby was threatening to sue for sole custody once the child was born, and in anger Carly blurted out that Jason was the father of the child. Carly then moved into Jason's apartment and Jason agreed to pretend he was the father until the baby was born. Unfortunately disaster struck, Carly woke up bleeding one night and passed out. Jason then rushed her to the hospital where she had to undergoe a C-section and deliver the baby prematurely. Carly's son was born with a birth defect and Carly suffered from internal bleeding. Jason however, authorized a surgery to save the baby's life. Carly managed to recover, but was suffering from post-partum depression and couldn't even touch her new son. After she was partially recovered, she left for a few weeks to get her head together and get over her fear of Michael. Shortly after she returned, Carly was able to hold Michael and began being a Mother to him. Jason had already come to love Michael. The three of them became a family, however Jason refused to make the arrangement a romantic or sexual one.
Then Carly's ex-boyfriend, a crazy Tony, kidnapped Michael. He was soon found, but was let free. Upon hearing this, Carly went temporarily insane and shot Tony. Carly is now locked up in an insane asylum awaiting trial. Meanwhile Jason has returned to his ex-girlfriend the hypocritical and incredibly boring Robin. Now, however, Carly is almost out of the asylum and looks like things will be heating in Port Charles once again. Also, Kimberly McCullough, the actress that plays Robin "the human nap" Scorpio, is leaving GH soon. Looks like Guza's "Titans" are going down. I once again have hope for Carly and Jason!