One would hope you would try to be obedient, though it is an imposssible situation.

The dominant, whether male or female, is probably thinking it's a no win situation.

If you cry and s/he is moved to likewise cry, will s/he appear weak in your eyes?
If you cry and s/he appears unmoved, will you think her/him uncaring?
If you cry and s/he smiles (for it is a true sign of your affection/love of her/him) will you think her/him cruel?

The second time my girl and I parted, she cried in the hotel room, I smiled, captioned with words to let her know how pleased I was with her.
She apparently cried a second time as I left her in the TSA line and returned to my car.