CALIFORNIA: Jake Gyllenhaal is back on the market. The actor has split from Sports Illustrated model Alyssa Miller. The pair dated for six months, but their romance has fizzled out. “They fizzled out. It happened a while ago - before the holidays,” a source told Us Weekly. “He’s back on the scene. “Things were really good between Jake and Alyssa right up until he had to leave for L.A. to go shoot a movie Nightcrawler in the fall. “Then the distance just really got to them. “They were apart for the holidays, and things weren’t good with them even before that.–SH