Getty Images Michael Porter Jr. is responding to his ex-girlfriend Madison Pettis calling him a “psychopath.” The 27-year-old Brooklyn Nets forward was on the Monday (May 4) episode of One Night with Steiny podcast. He discussed their brief relationship. “I wasn’t feeling that at all because, bro, we dated for what, three months, and nothing happened. Crazy,” Michael recalled. He and the 27-year-old Outer Banks star dated when she was starring o…