Lady Gaga apologized to fans Wednesday night for not speaking out sooner against her one-time collaborator R. Kelly, and vowed to never work with him again. “I stand behind these women 1000%, believe them, know they are suffering and in pain, and feel strongly that their voices should be heard and taken seriously,” she wrote in a long statement, her first public comments since the airing of the Lifetime documentary series Surviving R. Kelly. The singer called the mounting abuse allegations against him “horrifying and indefensible,” and said she plans to pull the 2013 song she recorded with him from iTunes and other streaming platforms. “The song is called ‘Do What U Want (With My Body)’, I think it’s clear how explicitly twisted my thinking was at the time,” she wrote. “As a victim of sexual assault myself, I made both the song and video at a dark time in my life… Til it happens to you, you don’t know how it feels,” she added. “I’m sorry, both for my poor judgment when I was young, and for not speaking out sooner,” Gaga said. The star has faced mounting pressure in recent weeks to condemn Kelly, who she previously appeared to defend. “R. Kelly and I have sometimes very untrue things written about us, so in a way this was a bond between us,” she said after working with him in 2013.