Yes, you absolutely have the right to be upset and to feel a range of emotions after discovering that your ex-boyfriend cheated on you while you were together. Infidelity is a breach of trust and can be deeply hurtful and devastating to the person who has been betrayed.
It is natural to feel a wide range of emotions in response to such a discovery, including anger, sadness, hurt, betrayal, and confusion. It's essential to acknowledge and process these feelings in a healthy way.
Infidelity can have a significant impact on a person's self-esteem and confidence, and it may take time to heal and rebuild trust in future relationships. Allow yourself to grieve the loss of the relationship and the trust that was broken.
It's important to remember that your feelings are valid, and there is no "right" or "wrong" way to react to such a situation. Take the time and space you need to process your emotions, and consider seeking support from friends, family, or a therapist to help you navigate through this challenging time.
As you move forward, try to focus on self-care, setting healthy boundaries, and learning from the experience. Remember that healing is a process, and with time and self-compassion, you can find a path toward emotional recovery and potentially even a more fulfilling future relationship.