As a family therapist, I often hear parents complain of a child who cannot move beyond an interaction, incident or situation, even when it has been addressed. In fact, the parent may have already listened, empathized with the emotion, and talked the issue out.
An apology happened.
Reassurance was provided.
However, the child just cannot let it go, looping round and round, like a hula-hoop stuck in motion.
To read more: http://www.psychedinsanfrancisco.com/kid-looping-negative-thought/