Regret and repentance thread through much of Antony and Cleopatra because betrayal is so often at stake. Characters can be redeemed by their feelings of regret, and we can judge the earnestness of their feelings by their willingness to repent. Regret is also another way of introducing a different perspective in the play. That each character could experience regret reminds us that their judgments aren’t hard and fast. Instead, each of them is a person capable of making mistakes, and they are all made more human by their ability to recognize and repent those mistakes.
Regret isn’t meaningful at all in Antony and Cleopatra. Aside from Enobarbus, all the characters that claim they feel regret still repeat their mistakes time and time again. This defeats the real purpose of regret, which is to avoid making the same mistakes again.
Regret is the one universal emotion in Antony and Cleopatra, through which each character develops and changes.