Osbourne's online statement came after TMZ reported Monday he and Sharon, his wife of 31 years, had split up and were living separately in Los Angeles.
"For the last year and a half I have been drinking and taking drugs," Osbourne, 64, wrote on Facebook. "I was in a very dark place and was an [expletive] to the people I love most, my family.
"However, I am happy to say that I am now 44 days sober. Just to set the record straight, Sharon and I are not divorcing. I'm just trying to be a better person," he added. "I would like to apologize to Sharon, my family, my friends and my band mates for my insane behavior during this period ... and my fans."
Celebrity Breakups and divorces of 2014 [PHOTOS]