High School Musical star Ashley Tisdale and Jared Murillo have split, a source tells Us. "They have not been dating for awhile now," the source says. "They just grew apart, but are remaining friends." See who else is single in Hollywood. The couple began dating in March 2007. Last October, Tisdale, 23, told Us she was "really good" with Murillo, 20, a dancer on HSM and member of boy band...