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Bobbi Kristina Brown's boyfriend Nick Gordon is fighting to meet the 22-year-old daughter of the late Whitney Houston and Bobby Brown who remains unresponsive in a rehabilitation facility in Atlanta. Reuters/Andrew Kelly

Bobbi Kristina Brown’s longtime boyfriend, Nick Gordon, is fighting for permission to see his girlfriend, who remains unresponsive at a rehabilitation center in Atlanta, according to sources. Gordon’s desperate bid to see the 22-year-old daughter of the late Whitney Houston and Bobby Brown comes just days after he checked out of rehab.

"Rehab was a success for Nick. He did very well and cleaned himself up. Now, he just really wants to see Bobbi Kristina," a source close to Gordon told People magazine. "It's hard for him not to be able to see Krissy. He wants to see for himself how she is doing.

"He only has third-hand information and doesn't know any more than what the media has been reporting," the source said, adding that Gordon is currently staying with his mother, Michelle Gordon, in Orlando, Florida.

Gordon checked in to a rehabilitation center on March 6 after his interview with Phil McGraw on the “Dr. Phil" show for an intervention, where he admitted his struggle with substance abuse. He also shared that he had been having suicidal thoughts following Bobbi Kristina’s hospitalization after she was found unresponsive in a bathtub at her Atlanta home on Jan. 31.

Gordon, who is under criminal investigation after injury marks were found on Bobbi Kristina’s body, is banned from meeting the aspiring actress. Authorities -- investigating a possible domestic abuse case -- have not filed any charges yet. Gordon, who first spotted Bobbi Kristina unconscious in the bathtub, reportedly performed cardiopulmonary resuscitation (CPR) in a bid to revive her as he waited for paramedics to arrive. Bobbi Kristina addressed Gordon as her husband, though Bobby Brown’s lawyer claimed in February that she was never legally married.

Gordon has been feuding with the Brown family since Bobbi Kristina was put on life support, claiming that Bobby Brown has been visiting his daughter “for publicity.” Meanwhile, Bobbi Kristina's aunt, Leolah, slammed the 25-year-old, stating that he was "manipulating Dr. Phil just like he manipulated" her niece.

Bobbi Kristina's grandmother, Cissy Houston, said last month that her granddaughter’s condition might never improve, while her father has said that she has shown signs of improvement.