UFC's Marvin Vettori Baiting Chris Weidman, 'You're Gonna Be My New Girlfriend'

NEW FEUD ALERT! Here's UFC middleweight Martin Vettori trying to trash-talk his way into a fight with Chris Weidman ... and guess what, Chris responded! 26-year-old Vettori -- who's on a 3-fight win streak -- is trying to get to that next level ...…