What can i do about this situation?

About two years ago i broke my girlfreinds trust and revealed very personal information(about past abuse) about her to a mutual freind and my mum. I didnt do it to be malacious, i just needed someone to talk to about it. I really regret and am really sorry, my girlfreind still holds it against me, she says that i have made it really difficult for her to face my freind. I am fed up of lving with the guilt and worry, what do i do?