I really hope people at work get tired of the effort involved in deliberately avoiding/ignoring me soon.
Having had a few days to work through my own emotions I've mostly settled into tired: tired of feeling like I am living in Jr High while at work ( I wasn't exactly fond of that whole dynamic when I was in Jr High, much less in a supposedly professional work environment), tired of being accused of being petty, tired of people telling me they no longer trust me.
It didn't take me long to realize that my initial urge to feel angry was pretty much a way to deny a whole pile of other emotional reactions: disappointment, sadness, irritation, frustration, self doubt, a rather petty urge to hurt the person in question... Anger is ever so much easier for me that all of that, always has been.
I can honestly say, after sitting down and working back through the reasons that I did what I did, that it was not my intention to hurt anyone on a personal level, and that I felt it would cause more harm to let the situation continue to deteriorate than it would do it haul everything into the light. I did consider going to the person directly but did not think then and do not think now, that it would have had the effect of curbing the behavior.
The biggest thing that I have had to remind myself of is that I am only in control of my own emotions and actions. I can't control how the other person acts or reacts, I am not in control of of what that person chooses to tell our co-workers or of how my co-workers choose to treat me. But I can damn well choose to stay true to myself and decide how I will behave in all of this mess.