But he also lost friends easily. He just couldn't figure out why most people eventually became uncomfortable when he was around. The ongoing pattern of quick acceptance and eventual rejection hurt him deeply. He felt he didn't have any true friends. And he couldn't see that the trouble sprouted from his own heart.
Rebellion leads to rejection.
This is most true in our relationship with God, of course, but it also holds true in many human relationships as well. All other people eventually reject those that they perceive as rebels. If you do not wish to be rejected as Saul was, then keep close guard over your heart.