Announcing the news on her website, the 'Nothing Compares 2 U' singer explained that "intense pressure" caused by Barry Herridge's circle of friends was the reason for their break-up.
She wrote: "From the moment myself and my husband got together not long ago, there was intense pressure placed upon him by certain people in his life, not to be involved with me. These were people who had never met me but had formed opinions of me based on what they read about 'Sinead 'O'Connor' in the media etc.
"Entitled as they are to their opinions about me, many perhaps well deserved, there was no righteousness on anyone's part to put my husband through what he was put through as a result of his desire to be with me and to marry me and as a result of his actually marrying me.
"Within 3 hours of the ceremony being over the marriage was kyboshed by the behaviour of certain people in my husband's life. And also by a bit of a wild ride i took us on looking for a bit of a smoke of weed for me wedding night as I don't drink. My husband was enormously wounded and very badly effected by that experience and also by the attitude of those close to him toward our marriage. (sic)
"It became apparent to me that if he were to stay with me he would be losing too much to bear. And that being with me was not going to serve him positively, career wise or any other wise. I saw his life leave him because of how people close to him reacted. And I can't take anyone's life. And a woman wants to be a joy to her husband. So.. U love someone? Set them free."
O'Connor continued: "He is a wonderful man. I love him very much. I'm sorry I'm not a more regular woman. I truly believe though it is painful to admit, we made a mistake rushing into getting married, for altruistic reasons, and weren't aware or prepared for the consequences on my husband's life and the lives of those close to him. He has been terribly unhappy and I have therefore ended the marriage. I think he is too nice to do so. And too nice to trap."
After asking fans and the media to respect Herridge's privacy, the star concluded: "We haven't been awful to each other. So while I feel sad for my husband, and sad to be the cause of sorrow to yet another poor man, I'm also happy that I know we weren't horrible to each other and he is better off free. And that I can be me. And that's a freedom I can't give up for anyone or anything. Neither should my husband or anyone else."
> Sinead O'Connor to release new album, tour in 2012