Bobby Brown banned Gordon from seeing his daughter after she was rushed to the hospital and placed in a medically induced coma following a near-drowning accident at her home in Georgia last year (Jan15).

Bobbi Kristina never regained consciousness and after months spent fighting for life she died in July (15), aged 22.

Family members and the deceased woman's court-appointed conservator maintain Gordon was in some part responsible for Bobbi Kristina's death, and now in his first full TV interview since the tragedy sent him to rehab, he insists nothing could be further from the truth.

In a two-part Dr. Phil special, which will air in America on Thursday and Friday (28-29Apr16), Nick insisted he was the only person who brought happiness into the lives of Bobbi Kristina and her late mother, Whitney Houston, during their final years.

"Regardless of what everybody thinks, I made Krissy and Whitney's last few years on earth as happy as they would be," Gordon told TV self-help guru Dr. Phil MCGraw. "I gave them somebody to trust, to talk to, to be there, someone genuine."

And in a scathing attack on his late girlfriend's father, he added, "He (Bobby) hurt his own daughter, not me. I was the one there for her while she was dealing with him not being there. He's not a reasonable person so I'm not planning on talking to him and I really don't want to."

Nick, who was clearly distraught and inebriated when he stormed out of a TV chat with Dr. Phil last year (15), appeared calm and thoughtful as he taped the new interview, during which he revealed he and Bobbi Kristina turned to marijuana after the 2012 death of Whitney Houston, who was also a mother figure to him.

"It was unfortunate but at the time that's kind of the the only way we knew how to deal with what had happened," he said, adding that his girlfriend's drug use "got really bad".

Gordon reportedly entered rehab for alcohol and Xanax abuse following his erratic appearance on Dr. Phil in March, 2015.

"I was drinking so much at the time because I could not deal with what was happening to Krissy," he said. "It mentally broke me. That's the lowest point in my life right there."