Why has he done this? Its real simple. Floyd Mayweather is scared to lose. He isnt scared of getting hurt like Ali as he implied to Bob Costas in a recent interview. He is scared of the danger that Pacquiao poses to his undefeated record. Mayweather is a very fragile human being and his whole identity is predicated on his undefeated record. In addition, if Floyd takes a loss, so too does his marketability and hence his bank account. He is no dummy; he knows that his undefeated record and his public persona is a huge reason why he is the immense draw that he has become. Floyd knows this and he wants the giant paydays to last as long as he is an active fighter. What he wants even more than that is for the public clamoring for a Pacquiao fight to go away. Floyd is almost certainly having nightmares about Pacquiao and if he never fights him and Manny ends his career without losing again the nightmares will continue into Floyds golden years. He is probably praying that Manny loses to Bradley so he can say: Why do I need to fight him now? He just lost."
Actually they are ducking eachother, clearly both sides have come out with excuses, neither really want the fight, neither need it imo... 98% chance it never happens.