Janet & James DeBarge's Secret Love Story EXPOSED!

James DeBarge never got over Janet Jackson, according to Dr. Conrad Murray!

Murray, 63, revealed to RadarOnline.com exclusively that he met DeBarge, 52, while he was incarcerated for involuntary manslaughter (pertaining to Michael Jackson's death) — and that the singer never got over his ex-wife!

"James DeBarge found that he could share things with me," Murray told RadarOnline.com. "So I listened to him. He told me that he cared very much for Janet."

"From my understanding of what he shared with me, he was still a man that never gave up on loving this girl and I think it may have affected all of his other relationships thereafter," Jacko's personal physician added.

DeBarge and Jackson eloped in 1984, but their marriage was annulled the following year.

Murray claims that according to DeBarge, the couple conceived a child during their short-lived marriage, but their daughter was given up for adoption in the hospital after her birth.

Murray published a handwritten letter from DeBarge supporting the claims in his book, This Is It!, and RadarOnline.com reported in May that the alleged daughter reached out to DeBarge via email after one of her adoptive parents died.

DeBarge revealed to RadarOnline.com at the time that he believed Jackson, 50, didn't tell him about their daughter because of "fear and lots of pressure."

Murray told RadarOnline.com that he believes that DeBarge's claims were true, simply asking, "why would DeBarge tell me a lie?"

"I'm not trying to damage Janet," he insisted. "This is a story that just came to me. I didn't ask for it. James said it….I have no reason to believe he would make up such a story. Not at all."

Jackson is currently pregnant with what fans believe is her first child. DeBarge went on to have three children, but never remarried.