Ultimately, ghosting should be reserved for situations where cutting off contact is necessary for your wellbeing.
The important ingredient in the anti-ghosting formula, however, is giving your date a real answer.
Some advice on anti-ghosting techniques offers solutions that are less than truthful so that avoid any discomfort.

However, the problem with white lie solutions is the potential fallout.
However, it’s possible for you to offer friendship if that’s something you’d like to try.

