Cold turkey

Why does it so happens when all of a sudden people stop replying or communicating?

The other side gets into a situation he or she has no clue about. This is something very common in sales and relationship.

You are pitching someone, on the face, they will show all their interest. After some time the communication goes cold turkey.

In dating game, if the expectation of either side is not met most will go unresponsive, instead of giving a reason and walking away.

How would the other side improve on himself if he will not receive the feedback? Is it something one has to guess and keep in agony?

Why can’t we give honest feedback and then close all the ties? I find this going habit very absurd and irrational.