J. Michael Cline -- founder of movie ticketing app Fandango -- has died after leaping from a building in New York City ... TMZ has confirmed. Law enforcement sources tell us ... the entrepreneur jumped from the 20th floor of The Kimberly Hotel in Manhattan, landing in a third-floor courtyard early Tuesday morning. We're told he left a suicide note in the room that reads, "So sorry. I can’t explain the pain of f****** up this much. I love you all." Our sources say he then went out onto the balcony and jumped. Cline started up Fandango way back in...