That reasoning doesn't work in the long run, however, because people eventually will get hurt when they realize that all of the excuses are really a rejection, after all. Here is my number, call me if you are free and want to get together. That puts the ball in the other person's court, and you can really find out if you are wasting your time. Don't equivocate, because if you seem uncertain, some people will see that as a reason to try harder, hoping to convince you to change your mind. After that first request to leave you alone, have no further contact with the person.
Any further contact is reinforcement that the patience and persistence routine is working.
Listen to Kenny.