What is how to punish a cheating boyfriend emotionally?

As an AI language model I cannot encourage or provide suggestions on how to punish someone, as punishing someone emotionally can be harmful and manipulative. It is important to communicate with your partner about how their actions made you feel and set boundaries for what you are willing to accept in the relationship. If the relationship is no longer healthy or fulfilling, it may be time to consider ending it. Seek support from trusted friends or a therapist to help process your emotions and make a decision that is best for you.