David Cassidy rose to fame as a former teen heartthrob and star of the hit 1970s TV series The Partridge Family. At 21, he was the highest paid solo performer in the world, and millions of young girls joined his fan club which had more members than Elvis and The Beatles combined.

But along with the bright lights, thousands of adoring fans and massive sold-out crowds, came problems that Cassidy struggled with secretly. The fame came with untold pressures that took a toll, leading to a dark battle with substance abuse, including multiple DUI charges. Now 66, the singer and actor recently revealed he has been diagnosed with dementia.

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In the video above, from Cassidy’s exclusive interview with Dr. Phil airing Wednesday, Cassidy addresses rumors that he is drinking again, which started to surface after a recent performance where he fell down on stage and appeared to forget lyrics to songs he’s been singing for decades.

“How did that performance go, in your opinion?” Dr. Phil asks.

“Well, the audience thought it was fantastic and as you can see the fans there, I heard nothing but amazing, amazing,” Cassidy says. “I was suffering, however, from laryngitis.”

Watch David Cassidy’s Recent Performance That Had Fans Questioning His Sobriety