It’s ok to feel blue sometimes, it's ok to feel free and happy.
As long as you have the legal go-ahead, don't rush back into dating, and are honest when you do meet someone, chances are your feelings will become increasingly more stable and positive.
Other than perhaps the death of a family member, the severing of what was expected to be a lifelong union is about as emotionally crippling as any life as experience an individual will ever survive. If one of us knows they want out, what’s the point of a separation in the first place?
Even when the divorce is amicable, as mine was over a decade ago, the massive weight of the realization that the world you had built with your soon-to-be-ex and the end of your journey with a person who at some point was the closest person in the world to you is downright smothering. Are we supposed to see each other a certain number of times a week? Or do you tell them that the marriage is over, no chance of being mended and that the paperwork is simply a formality? I recall going through that period, knowing full well that the marriage was over and that, indeed, the paperwork was just the final punctuation.
Other mornings you may still feel twinges about the fact that your first marriage didn’t work out how you’d imagined.