What crying? GSP clearly doesn't want the fight. He probably suspects that Anderson would beat him, perhaps even soundly. And he's content to reign over WW as... you know... the WW Champion. End of story.
I get that fans want this. Heck, I want it. But you can't make any man fight against his will. A GSP who feels pressured into this thing is not going to perform well against an already Godly opponent.