Trust has been shattered.

Hey. This is mainly a rant/need to unload whats on my chest, but any advice on where to go from here would be much appreciated.. Last week, I fell out with my best friend (lets call her A), because she needed off work due to illness, and it meant I had to come off a shift in the middle of the one I was working, go home, and go back to work later on to do her shift (we work the same place, I know that probs doesn't make any sense). Because I was quite happy doing MY shift, and had my evening planned to do college work, I was quite reluctant to cover for her. I said things I shouldn't have to other colleagues (O & B), and one of them (B) passed it onto my best friend. Understandably, she was mad/upset, and hasn't spoken to me since even though I've apologised profusely. Yesterday, I got a text from another friend (N) warning me that A had told B (and 4-5 others) secrets that I had trusted her with; seriously intimate details about my sex life. I got her to promise not to tell anyone these things, because if they get out, they could cause a lot of problems for more than just me. B has since told two people (N and another person). Just because she was mad at me (all I said was I was going to make her feel guilty for making me work, which may not be the nicest thing to say but I'd never actually do it), A has spread these details, which will make work hell for me later on today, and my trust in her has been well and truly shattered. I have no idea what friends I can trust anymore, as she was probably the only one I would have trusted with my life; now, not so much. A mutual friend is forcing us to her house later on this week to sort this out, but I really don't know how to handle this.. I feel so betrayed/hurt by A. Any advice guys? :/

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