Human happiness is build on an illusion, illustrate it by Oedipus Rex?

Oedipus' happiness was built on falsehoods. He's happily married, has a family, and rules his land, but that happiness is shattered as his dual roles in the tragedy are unveiled.

Throughout the play, a central inconsistency dominates - namely the herdsman and Jocasta both believe Laius to have been killed by several people at the crossroads. The story, however, reveals that Oedipus himself alone killed Laius. How can Laius have been supposedly killed by one person – and also by many people?

Oedipus is searching for Laius’ murderer: he is the detective seeking the criminal. Yet in the end, these two roles merge into one person – Oedipus himself. The Oedipus we are left with at the end of the play is similarly both father and brother. Sophocles’ play, in fact, abounds with twos and doubles: there are two herdsmen, two daughters and two sons, two opposed pairs of king and queen (Laius and Jocasta, and Polybus and Merope), and two cities (Thebes and Corinth). In so many of these cases, Oedipus’ realization is that he is either between – or, more confusingly, some combination of – two things. Thus the conflict between “the one and the many” is central to Sophocles’ play. “What is this news of double meaning?” Jocasta asks (939). Throughout Oedipus, then, it remains a pertinent question.