I feel amazing!

I have reached the conclusion that you never know your real worth unless you put yourself out there.
It’s scary and you feel vulnerable as hell, but it pays off. After nearly 3 months of doing nothing, I decided that since I’m not learning anything new or even using my existing skills, I might as well quit and make use of my MA and my language skills. So I re-started the job hunt and gave in my notice.
I am now in a position of getting an offer from an outside firm as well as may be a better deal from my current organization. So I get to choose and I get to decide!
I feel amazing. I feel happy enough to shout woooohooooo down the street and dance about a bit. It’s like this huge burden off my shoulders/ chest/ inner being…I’m actually smiling and not in a bad mood for the first time in months! (Man! Why did I put myself through that????)
It’s amazing and makes me realize that I shouldn’t have settled for less in the first place! Yes, I’m an idiot.
The funny thing is that my immediate supervisor has no idea that the Managing Director of the company (yes, the big man himself) has told me that he’ll try and find me a more challenging role – we’re a smallish outfit so the MD comes over on daily rounds and meets anyone that wants to talk to him – so we had a bit of a chat this afternoon and he’s this nice grand-fatherly sort and really likes me…so fingers crossed!
But my line manager, the petty idiot, is trying to get me to bitch about the job and ppl around here to him (like I would). I wish I knew a polite way to tell him that he is the reason I wanted to leave in the first place. I’m open to suggestions on this.