Niles: No, no, no. Just listen. You thought you were angry at Thomas Fallow for failing to thank you for the contribution you made to his life. But perhaps the person you're really angry at is yourself. You never thanked Miss Warner for the contribution she made to your life.
Frasier: I was only seventeen years old, I'm sure she understood.
Niles: Perhaps she didn't. She was a vulnerable, lonely, middle-aged woman. It is possible that her feelings for you ran deeper than you realized? Feelings which you crushed when you disappeared without so much as a thank you or a goodbye.
Frasier: Yes well, thank you and goodbye!
Niles: All right. Fine, I'll just leave you with this thought: your encounter with Thomas Jay Fallow was unsatisfactory because it failed to provide you with the closure you were seeking. For that you will have to make amends with Miss Warner. Aha.