Phillips, speaking publicly for the first time since leaving Pine Grove Behavioral Health and Addiction Services clinic in Hattiesburg, Miss., said he wanted to take ownership of his mistakes.
The former New York Mets general manager was dismissed from the worldwide leader in October after details of his affair with young staffer Brooke Hundley surfaced.
Phillips said he'd realized two months earlier that he had sex-addiction issues.
"I recognized in August, I needed help," he said. "I started calling facilities."
"I couldn't stop myself from doing the things I was doing, even knowing the consequences," he added.