Firstly, it's essential to acknowledge that cheating is never acceptable behavior, regardless of who does it. If you're feeling guilty or ashamed about your partner's actions, consider talking to a therapist or counselor who specializes in relationships and ethics.
Therapists can provide a safe space for you to express your feelings, share your experiences, and receive guidance on how to navigate this challenging situation. They may also be able to offer valuable insights into the dynamics of your relationship and help you identify any patterns or red flags that may have contributed to the infidelity.