why might somebody give you a tearful goodbye? because you have plans to see each other again tomorrow…

Brief Explanations:

Tearful good - byes are often associated with strong emotions due to long - term separation. When people know they will see each other soon (like tomorrow), there is usually no need for such an emotional farewell. But when they won't see each other for a long time, the sadness of the separation can lead to a tearful goodbye.

Answer:

because you won't see each other again for a long time