In a relationship things about ourselves are discovered. For example, being told you interrupt too much is a chance to become introspective and improve that trait so one could become a better listener. Staying by ourselves too much may inhibit our growth potential.
Solitude is healthy; lonliness is dis-ease. Gather around quality people who'll help us grow into people who choose to evolve; over the course of a good relationship or friendship, they will reveal things to us which teach us where we should seek to improve.