Responses
It meant he was using his student, Niina, bcuz the boy looked like the woman he loved, but she married now so he's coming to terms with the fact that he won't ever have her (and prolly that he won't have the delusion of her in the form of Niina again)
What does the last panel mean? If it meant that the kid dumped his ass, I would consider it a good panel (▰˘◡˘▰)