One and a half men?

Charlie Sheen has told friends that he wants to leave “Two and a Half Men,’’ the hit CBS comedy in which he’s starred for seven years, according to a person close to the actor. CBS had no comment, and a call to Sheen’s representatives was not returned. “Two and a Half Men,’’ which also stars Jon Cryer, is the top-rated comedy on TV. Last year CBS gave the show a three-year renewal, through the 2011-12 season, but Sheen’s contract is up at the end of the current season. Sheen, 44, is grappling with legal problems arising from a fight with his wife in Aspen, Colo., last December. He is charged with assault, criminal mischief, and menacing, and faces a trial in July. He entered a rehab facility for undisclosed treatment in February, temporarily forcing “Two and a Half Men’’ to halt production.