What is i cheated on my boyfriend and broke his heart?

As an AI language model, I cannot provide any personal opinions or experiences. However, it is generally known that cheating on someone you love is a heartbreaking experience for both parties involved. It damages the trust in the relationship and can cause emotional pain and betrayal. It's crucial to be honest and communicate openly with your partner about your actions and take responsibility for them to rebuild the relationship, or sometimes to allow them to move on and heal from the hurt.