Dex and Alexis's relationship is short-lived. In episode 162, Blake and Alexis are in an oil rig explosion in the South China Sea. Dex and Krystle (Blake's wife) rush to the hospital, only do discover they have disappeared. In episode 163, they find out that Blake is suffering from amnesia, remembering nothing past 1964. Alexis has convinced Blake that they're still married. When Blake's memory returns, Dex accuses Alexis of still loving her ex-husband. They fight, and Dex finally tells Alexis he is leaving her for good in episode 165.