To wish someone good riddance is to be pleased that they are leaving, but in this context there is no such indication and the wish is to stay and continue seeing them.
Consider the statement "He pushed himself through the rift without so much as a goodbye, or even a wish that he could have stayed and continued seeing that person.". Is the statement "He pushed himself through the rift without so much as a goodbye, or even a good riddance." false? Yes/no/unknown