The former "Cheers" star told the New York Post his estrangement began when he was "going through a lot of self-doubt; self-loathing,” and "drinking a lot."

Danson previously apologized to Grammer for 30 years of 'missed' friendhipSounds like Kelsey Grammer and Ted Danson have much to Cheers about.In October, Danson hosted Grammer on his Where Everybody Knows Your Name podcast with Woody Harrelson and apologized to the Frasier star for "getting angry" at him once during their Cheers years,

"It was at a time in my life when I was actually going through a lot of self-doubt, self-loathing, honestly," Grammer said. "It was when I was drinking a lot."