If your ex says they are happy, it can evoke a range of emotions in you, depending on your personal experiences and feelings towards the situation. It's entirely normal to feel a mix of emotions, including happiness for them, curiosity, sadness, or even a sense of closure. How you feel may also depend on the nature of your past relationship, the circumstances of the breakup, and how much time has passed since then.
If you find that their statement is affecting you emotionally, it's essential to take care of yourself and process your feelings in a healthy way. Give yourself the space and time you need to heal and move forward. Surround yourself with supportive friends or family, engage in activities that bring you joy, and consider seeking professional support if you find it challenging to cope with your emotions.
Remember that everyone's journey after a breakup is different, and it's okay to have your own feelings and reactions. Focus on your own well-being and personal growth, and over time, the emotions will likely become easier to handle.