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  REUTERS/Fred Prouser/Files
  Fantasia Barrino, one of the final two "American Idol" contestants waves to fans after performing her final song in competition in Hollywood

Fantasia Barrino is back in the headlines one month after the birth of her second child, following reports that her married boyfriend has cheated on her.

The 27-year-old American Idol winner recently had a child by boyfriend Antwaun Cook, and sources claim that he has been cheating for some time, according to Radar Online.

"Antwaun has been cheating on Fantasia all along, just like he cheated on his wife with Fantasia," a source told Radar.

"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," the source added.

Cook, a former T-Mobile salesman, is still legally married to wife and mother of his other children, Paula.

According to reports, Cook has been cheating on Barrino for some time and secretly tries to rekindle his relationship with his estranged wife.

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"He tries to get Paula to take him back all the time, but she wants nothing to do with him," the source revealed.

"Fantasia knows that Antwaun cheats, but she just turns a blind eye hoping for some fairytale turnout."

Barrino, who also has a daughter from a previous man, still faces the possibility of being sued by Paula under North Carolina's Alienation of affections Law.

After beginning a relationship with Cook in 2009, Paula accused Barrino of having an extramarital affair, allegedly while she and her husband were working on their marriage.

In August 2010, Barrino was hospitalized after reportedly trying to commit suicide that critics suspect was the result of being dumped by Cook in the midst of getting legal threats from Paula.

"Fantasia was still devastated because she believed they had a future together ... She was also stressed out about the complaint filed by his wife," a source told Radar.

Barrino previously had an abortion after getting pregnant by Cook in 2010, and after a second pregnancy decided to keep the child.

One source claims that Barrino's decision to keep Cook's child was strategic.

"She kept this one to keep him," the source claimed.