When Lamar Odom appeared on the syndicated talk show The Doctors on Jan. 17 and declared, “I want my wife back,” he immediately landed himself in hot water with ex Khloé Kardashian’s new man, fellow basketball player Tristan Thompson. “Tristan went ballistic,” an insider exclusively reveals. “He called up Lamar and told him he acted foolishly, and he warned him to stay away from Khloé or else.” Although Tristan, 25, has only been dating Khloé, 32, for four months, he’s well aware of the pain that Lamar, 37, caused her and the drama of their dragged-out divorce, which was finalized in December after a three-year process. “Deep down Tristan knows Khloé would never take back Lamar,” the insider says, “but he is concerned that his girlfriend will fall for Lamar’s…