I'm being screwed over royally, but it'll be ok, I have a plan

My job situation has been drastically, painfully overhauled. To make a verrrrrryyyyy long story short, my predecessor at my current job, who I used to work under, wrote me an email today asking if I had gotten a new job and to keep him posted (I work in the arts/ticketing world and we're a pretty close knit group in terms of knowing what's up with one another professionally). I replied that my job search was on hold until after the wedding, and then it occurred to me that hadn't inquired as to his latest position, so I revisited the deleted item in my outlook, only to then notice the subject line: "I saw your job posted on the internet?" At that point, a big ugly What The F*ck!! erupted from me, and I went to the posting page and lo and behold, there, in fact, was my position posting!

So, I freaked out, called HR with a WTF need for conversation. I must first preface this with a remark that I was initially hired a little more than a year ago with the knowledge that I was filling in for a while until I could get a job in my field, and that back in November my supervisor mentioned in a meeting with me that they were "considering" reposting my job, to which I replied that I was perfectly content with doing the best job I could for them until something did come up. After that conversation, nothing had been done, and there was no confirmation that anything would be done, at that point, nor a future timeline. Now, 2 1/2 months later, poof!, it's posted, without a "hi, howdy do, guess I should let you know" conversation from my boss. F*cker!

Once I was relatively calm again, I called to a place where I had interviewed right before christmas to follow up...I figured I might as well hammer that last nail on the job coffin while I was down on the ground. Surprise of surpises, the lady at that company tells me that she cannot wait for me to start!! How is that for a twist?! All I need now is something in writing from them, and you bet your bottom that I will be marching my smug self into my current boss' office and tell him how low I think it was to post my job without so much as a courtesy call to let me know it was happening, and say that I have a job offer, and adios (with a big mental "bite me" chorusing in my head)!

Tonight, I am still overwhelmed, hurt, excited, and scared. But I had to vent. My wonderful D came up to comfort me, and we've decided to bump up our move-in-together date for the sake of our finances, and I am doing my best Gloria Gaynor right now--I will survive.