If we make a habit of being unreliable, we will soon have a collection of ex-friends. The new friends may not last. Isolation could be the unplanned consequence. A perfectly planned life might be quite boring. On the other hand, we want the reassurance of stability in our lives.
Some people find themselves flipping and flopping from stability to upheaval throughout their lives.
We crave the stable relationship. When we get it, the stability can stagnate into boredom. The desire for excitement can become too much. The danger is to sacrifice the stability for excitement. The instability of an exciting life leaves us stressed, lonely, and again craving for stability and certainty.