Some people see the termination of a discussion with a potential business partner as primarily a sign of their self-worth. They allow their ego to be bruised, and take being turned down very personally. Furthermore, they view further contact with a high degree of scepticism (why should I bother?) or are wary being perceived as boastful when updating them about an opportunity they missed out on.

Others maintain an equilibrium, parking their ego, and simply move onto the next conversation. Knowing that rejection is rarely final and unless they have been talking to a proven idiot, both parties genuinely wanted to see this succeed but they have come to a rational decision, at that specific point in time, and under the prevailing knowledge and conditions. It is rational to stay in touch, at an appropriate juncture thereafter, to explore future opportunities, and update each other on your future success, and interests.