American Idol alum Fantasia Barrino knew her boyfriend Antwaun Cook was still living with his wife when they started dating and RadarOnline.com has the exclusive email exchange to prove it.

EXCLUSIVE DOCUMENT: Fantasia Knew Boyfriend Was Married -- Read The Email

"You going back home really did it for me. I'm sorry," Fantasia wrote in an email to Antwaun dated April 16, 2010.

"How do think I Feel? When your still staying over there... But you telling me you want to Be with me..."