is convinced Jennifer is fooling around with Pitbull behind his back and that he's on the chopping block," said a source. "He confronted her and demanded to know if she's having an affair with Pitbull. Then he ordered her to cut ties with him. Jen was so taken aback that at first she just laughed in Casper's face. "But then she got really mad. She shot back at him, 'Don't you talk to me like that!' and stormed off. Later, she reminded Casper that she's the boss and moneymaker in the relationship - and if he doesn't like the terms, he can hit the road. And if Jen dumps him, Casper knows his days of living high on the hog are over. He broke down and sobbed, 'Jen can't leave me yet - she promised to make me famous!'" Jennifer Lopez and Pit Bull filming 'Live It Up' in Miami Jennifer Lopez and Pit Bull filming 'Live It Up' in Miami Jennifer Lopez and Pit Bull filming 'Live It Up' in Miami Jennifer Lope...