Fantasia: Antwaun Cook Accused of Cheating on Singer

Erika Goldring, Getty Images

A month after giving birth to their first son, it is being reported that singer Fantasia's relationship with Antwaun Cook is already on the rocks.

A source tells RadarOnline.com that the 'American Idol' winner's boyfriend has been stepping out on her for the majority of their relationship, which began while Cook was still in married to his wife Paula.

"Antwaun has been cheating on Fantasia all along, just like he cheated on his wife with Fantasia," the source revealed. "She was silly to think he'd remain faithful but it was wishful thinking, I guess. She purposely had this baby with him hoping he'd be a devoted father and boyfriend."