I'm afraid the picture in our head of how our life should have been rather than how it is in reality can really hold us back from moving on. Until we accept that there is new future which may not be what we thought it would be, could be fulfilling too.
It took me quite some time to get over the loss of a family unit that never got the chance to be. When I finally did, I began to move forward in my life and rarely ever look backwards.
not moving forward is impacting you, your new loving partner, and at the same time, still will not make your future what you thought it would be.
I agree with kat, you need resolve these issues and legalize your divorce before you can move forward. perhaps then you will get your closure. And honestly, sometimes we just need to move forward without the closure.