I think the feeling of something ending is a profound one and one we don't necessarily have a good sense to detect - unless the circumstances are obvious and in the forefront.
The Million Dollar View – The Relationship Between Distance and Gratitude
The Illusion of Regret – Why Regret May Not Be What We Think It Is
Perhaps this feeling is not trying to pull you back to your past, but pull you into a future you internally want to see manifest. Something you may not have had the courage to do in the past but something you are ready to embody or 'be' now.