Why do some people feel more motivated to pursue their passions after receiving feedback from strangers online?

So my sisters boyfriend set me up with his cousin in a long distnace relationship. He broke up with me with the promise of friendship because he said I hadnt done anything wrong. Yet he doesnt text me back. What should I do?
Have you ever witnessed rude behavior from other customers, and did it affect the service you received in any unexpected way?
Do you believe being nice to service staff makes a difference in the long run, even if you don't always see immediate rewards?