Former rabbi who was accused of sexually exploiting a high school freshman and who then moved to Israel to start a mystical community, only to lose it after having affairs with multiple followers. Mr. Gafni was born Mordechai Winiarz to an Orthodox family in Pittsfield, Mass., in 1960. His family moved to Ohio, and he attended an Orthodox Jewish high school in New York City. After high school, Mr. Gafni stayed in New York to study. Mr. Gafni moved to Israel in 1988 and changed his name from Winiarz to Gafni — from a Polish cognate for vine, or wine, to a Hebrew one. He became a popular teacher and briefly had an Israeli television show. About 2000, with two other rabbis, Mr. Gafni started Bayit Chadash, or New Home, a community that held classes and weekend retreats focused on mysticism and creative worship. Mr. Gafni, who has been divorced three times, said that any mistakes might have occurred because he was in denial about his polyamorous nature. “It’s kind of like being a gay guy in the ’50s,” he said. He now lives with his partner, Lori Galperin, a psychotherapist who is on the board of Mr. Gafni’s center.