I've done a terrible thing..how do I move on from this.?

I've done a terrible terrible thing to the person I loved so much. I know people will say if I truly loved him I wouldn't have done it but I was extremely angry and I lost it. we'd had some bad news and he blamed me..cutting off our relationship and refusing to talk to me atall. In desperation I turned up at his work, although I know I should have left it and talked another time as I knew in my heart I hadn't done anything. we had a mive argument I detailed some very personal things which his colleagues heard and he's now lost his job and was extremely humiliated. This guy was my best friend and I can't believe what I've done..I saw him after and I just couldn't stop crying. He trusted me and I broke that so badly. I'm not expecting reconcilliation..I'd love him to forgive me but I just don't deserve that. What can I do..I don't even want to look at myself I feel sick that I'd do that.