Sage
I also think this is the middle. You have to let go to have room for other relationships......
Growth is hard, and uncomfortable. The Language of Letting Go has a daily reading about this place being like transplanting a plant so it can grow to the full potential. I see what you are describing as this.
While painful, I think it is only a sign of growth, not a sign that you are doing anything incorrectly or wrong.
Also I often did not yet have the skills for the new when I was in the process of letting go. First I had to dump the skills that had gotten me there.