NEED TO KNOW

Charlie Sheen says he still regrets how Two and a Half Men ended in 2011, amidst his spiraling addiction issues

He's now telling all in a new memoir and documentary, and he told PEOPLE he hopes to get in touch with Jon Cryer someday

He notes that Cryer was incredibly compassionate and insightful in his reflections on Sheen

For eight years, between 2003 and 2011, the sitcom Two and a Half Men starring Charlie Sheen and Jon Cryer was one of the biggest shows on television — but production had to be halted in 2011 after Sheen's drug addiction spiraled, and the network eventually decided to fire him. (He was replaced by Ashton Kutcher, and the show continued for three more seasons.)

Now, Sheen, who turned 60 on Sept. 3 and has been sober for eight years, is looking

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