Some people are so self-centred that they forget it is them against the world. This behavior can really jeopardize our happiness. If you have to live with just yourself, what happens to the rest of the world? It might be some practice of selfishness which you don’t know or does it intentionally. Remember our behavior towards others is just as important as building blocks of self-respect.
Interaction with people can also reveal some unexpected horrible behaviours. Commitment to human relations can avoid this kind of behaviour. The unfair aspects of it are that, your commitments might not be reciprocated by the people you act towards, which makes certain human behaviours and facts so difficult to fathom.